A couple things:
A new mob that is normal, but not OP, just like the defualt mobs in 1.2.5 and below. (Creeper, Skeleton, Spider, Etc...)
Something better than diamond! (Emerald Tools anyone?)
Breakable Bedrock.
New types of TNT. (Nuke!?!)
New passive mobs (Cows, chickens, etc)
BACON!!!! (Recipe= CP CP CP) (CP= Cooked Pork)
Heals 7 hearts
Upgradeable Pistons (Move 2 blocks, 3 blocks, etc)
Cheese!!!! (Recipe= M M M) (M=Milk)
Sandwiches! (Recipes are obvious)
Heals 8 hearts
Easier Building Please!!!
That is all...