12w40a is out and there are many things new!
The most notable is that in superflat worlds,they have strongholds,lakes,ores,pumpkins,cacti,sugarcane,etc!
It is pretty good and I love it!They also added a redstone ready preset which has 52 layers of sandstone,3 layers of stone,and 1 layer of bedrock.Also,they have natural which huts in swamps!Slimes now spawn in swamps at night.This snapshot was a nice one and I can't wait for next week!

download----->http://www.minecraftforum.net/news/625-12w40a-snapshot-ready-for-testing/