https://piratepad.ca/p/DqEHOKVBK7 Etherpad link, so we can discuss and edit it together until we send it to Mojang (xD)
Dokuwiki export of that draft:
**__Map Generation and Biomes__**
**Continents and Oceans**
  * Two basic map types: Oceanic/Continental maps (based on [[https://mojang.com/2013/08/minecraft-world-generator-update/]] )
    * Oceanic: old, as until 1.6
    * Continental: new, like 1.7 proposition
  * Regardless of the basic type and the seed, the Ocean/Continent ratio can be set:
    * Sea/land in 10% steps between 20:80 and 80:20
    * Standard: 40:60
    * Biomes get replaced by Ocean, or Ocean by other Biomes
  * Scalable Biome size: can be set in steps (0.5x, 1x = current standard, 2x, 3x, 4x = large biomes as included now)
**Biome Types**
  * Smoother transitions between biomes (//"Biomes will avoid getting placed next to a biome that is too different to itself"//)
    * Biome categories (and transitions) should also consider humidity (similarly to the system until beta 1.7)
    * Example: The transition between Jungle and Desert would require a Savannah in between
    * Other biomes a Jungle could border: Forest (including Birch and Roofed Forests), Swamp
    * Allow sharper transitions by putting Extreme Hills in between
  * Tundra biomes should be somewhat smaller
  * Island biomes
    * More larger islands and archipelagos
    * Less random distribution of islands all over the sea
    * Less tiny islands that aren't part of any archipelago
    * Technical "Island" biome (on Oceans)
    * Main Biome depending on the climate of the nearest/surrounding areas
    * "Plains" islands should still be the standard
    * Possible variations: Savannah, Jungle, Forest, Tundra, Hill/Rock Island (similar to Extreme Hills with more Gravel), Mushroom
**Other**
  * You can set an average temperature/humidity to change this (make a colder/hotter or wetter/drier map)
    * this will affect the biome distribution
    * drier map: more desert, less jungle/swamps for example
    * converts, for example, some Swamps/Forests/Jungles into Plains or Plains to Desert
  * Rivers are less random; have a source and a mouth now
    * they are also continuous, no longer segmented by dry patches of land; perhaps they should be broader too
  * Technical biomes:
    * Flat Jungle
    * Jungle Pond instead of River patches
    * Desert Oasis with palm-like trees (in normal Deserts), as a variation of Jungle trees
      * Also, Desert River with similar vegetation
    * Rivers (including the grass colour) always fit the surrounding biomes
  * Less ravines and mineshafts
    * Abandoned Mineshafts are found near NPC Villages, rarely somewhere else
**__Mobs and Related__**
  * Villagers (or one type of them) can work for someone (like harvest/replant fields or cut trees)
    * Must either trust someone or be paid in Emeralds (or something else)
  * Make Saddles more common (depends on the intended game balance though) - multiple options
    * Distinguish between Horse and Pig saddles
      * Make Pig Saddles craftable
      * Horse Saddles only found in Dungeons or sold by Villagers
    * No distinction, but somewhat better availability
      * Make Saddles craftable or more commonly available for sale from Villagers
      * Saddles found in Dungeons would be enchanted, with additional effects
  * Hostile mobs in the water
    * Sharks in Oceans (rare, like Endermen?)
    * Piranhas in Jungle lakes/rivers
  * Seagulls roaming the Oceans in small flocks
    * purely decorative, like bats
  * Zombies and Skeletons wear/drop colored instead of enchanted random Leather Armor
  * Block that prevents Slimes from spawning in a certain radius or chunk
    * Example: Something made of Lapis/Glowstone/Redstone
**__Blocks and Items__**
**Food and Potions**
  * Sandwich **Burger** (to make Bread more useful again)
    * Example: 4 Bread + Raw or Cooked Porkchop (-B-/BPB/-B-) -> 4 Sandwiches
    * Heals 7 points (3.5 hearts)
    * Saturation: 8.4 or slightly better (higher than Baked Potatoes, but lower than Steaks/Cooked Pork)
  * Apples and Poisoned Potatoes as Potion ingredients
  * Fortune tools used on Oak Leaves increase Apple drop rate
  * Jungle trees drop Golden Apples (very rarely)
**Building Materials**
  * Gravel craftable from Cobblestone
    * 2x Cobblestone -> 1x Gravel
  * Sandstone variations
    * Smooth Sandstone (4x, square) -> 4x Sandstone Brick
    * Texture: Variation of Stone Brick
    * Smooth Sandstone (3x, row) -> 6x Smooth Sandstone Slab
  * Dirty Sandstone (somebody please come up with a better name)
    * 2x Sand + 2x Gravel = 1x Dirty Sandstone
    * Texture: Mix of Stone, Sandstone and Gravel, "dirty" light brown
      * Example: [[http://abload.de/img/dirty_sandstone_57zswx.png]]
      * Just to get the general idea, at least the colour should be similar to that
    * Dirty Sandstone (4x, square) -> 4x Dirty Sandstone Brick
    * With Slab/Stairs/Pillar variations
  * Brown Stone
    * 2x Red Sand (or Netherrack) + 2x Gravel = 2x Brown Stone
    * Texture: Basically a medium/dark brown stone
      * Should not be too similar to Hardened Clay
      * Example: [[http://abload.de/img/brown_stone_37ts47.png]]
    * Brown Stone (4x, square) = 4x Brown Stone Brick
    * With Slab/Stairs/Pillar variations
  * Stone Slabs (with a normal Smoothstone texture)
    * Rename: Stone Slab -> Light Stone Slab (somebody please come up with a better name)
    * Stone (3x, row) -> 6x Stone Slab
      * Texture: Stone texture
    *  Stone Slab -> Light Stone Slab (convertible)
    * Light Stone Slab (2x, column) -> Light Stone (Double Slab, like 43.8 now)
    * Add Stone and Light Stone stairs
  * Pillar block variations
    * Craft 2 blocks of the same material in a column (like Quartz)
    * Possible with: Stone, Sandstone, Dark/Dirty Sandstone, Brown Stone
  * Textures depend on the direction the block is facing when placed
    * Like Wood/Quartz Pillars now
    * Should also apply to the top side of different Bricks and Wooden Planks (nope, too complicated and messy)
  * Tinted Glass
    * Crafted from eight Glass blocks and one Dye, like Hardened Clay
    * Tinted Glass blocks can be crafted into Tinted Glass Panes
  * Coloured Birch Planks
    * Crafted from eight Birch Plank blocks and one Dye, like Hardened Clay
    * Coloured Birch Planks can be crafted into Coloured Birch Slabs/Stairs
**Other**
  * Ferns appear when using Bone Meal on grass in Jungles/Forest/Swamps
  * Lily Pads can be farmed (spread like mushrooms in swamps under certain conditions)
  * Two different Book types:
    * (Normal) Book: Like the older recipe; usable to craft cheaper Bookshelves (for decoration purposes)
    * Leather Book: Like the current recipe; usable for Enchantment Tables, Enchantments and Written Books
  * Stronghold Bookshelves drop Enchanted Books when destroyed
  * Something like an Anvil/Chest/Furnace which allows to edit blocks
    * Example: Stone Brick -> Mossy Stone Brick or Oak/Birch Sapling -> Dead Bush
    * Costs Exp, Emeralds and/or something else, for example Vines for Cobblestone -> Moss Stone
  * Mob Spawners: more easily restorable (using damage values or different block types, unlike the current solution)
    * Reason: can be griefed (destroyed) too easily on SMP, with little chances of restoration