The following things are confirmed to be in 1.9:
Villagers
Nether Brick
Nether Ruins
Netherrack Fence
2 New Mobs in the nether (Blaze and Magma Cube) and two others in new biomes (Mooshroom and one other, possibly the Snow Golem) [1]
New items from nether mobs (Blaze Rod, Ghast Tear, Gold Nugget, Nether Wart)
Animal Breeding
Lilypads
Villagers of 6 different types
Nether Brick
Nether Brick Fence
Nether Brick Stairs
Nether Ruins
Blaze
Magma Cube
Mooshroom
Snow Golem
Mushroom Biome
Blaze Rod
Ghast Tear
Nether Wart
Lilypads
Swamps have different colored water to fit.
Snowy Biomes appear again.
Endermen no longer grab blocks that are usually made only by the player.
Is there any mod that turns the villagers into Steve's, or different assorted human mobs?
That's my screenshot. I found the texture file for a villager Steve in the game files, and Audax made me apply that to actual Villagers. That was the result.