OK, so this will be edited a lot.
Next Minecraft Update: Minecraft 1.7Release date: Unknown
TREES
There should be a new tree, named a "cherry tree" which will also come with a new food: cherries. Spruce trees will alos exist in the Extreme Hills biome.
BIOMES
Jeb did post a pic of a badlands biome made with hardened clay. There should also be biomes from the "Biomes O' Plenty" mod.
www.youtube.com/watch?v=s5P1e_EhciY GAMEPLAY FEATURES AND BUG FIXES
.Added more options in "Options" menu
."Reset" button
.You may now bind screenies, cinematic view POV different keys
.Fixed Stronghold torch bug
.Fixed Village Water bug
.Fixed Zombie Pigmen spawning by lightning do not carry swords
MOBS
None confirmed ATM
ITEMS
MAYBE new wood and new leaf block (Cherry) and maybe cherries- food
And I got most of this from MC Forums Upcoming Features, posting here to save you the trouble. View it here:
www.minecraftforum.net/topic/1859166-17-newsfeaturessnapshots-compilation-8213-biomes-o-plenty/