I would assume that if you have worlds generated before the current snapshot (12w07b) they will have the caves that were initially there, but any new chunks that are generated in 12w07b will likely not have caves. (and trees are missing from Taiga biomes entirely)
So do not use any survival worlds you actually intend to keep playing in the new snapshot, until most of the key generation issues are fixed.
Rollback Post to RevisionRollBack
When no one was looking, the Endermen took forty blocks.
They took 40 blocks. That’s as many as four tens. And that’s horrible.
Super Hostile maps I've completed: Spellbound Caves (Yeah, I pretty much suck.)
So do not use any survival worlds you actually intend to keep playing in the new snapshot, until most of the key generation issues are fixed.
They took 40 blocks. That’s as many as four tens. And that’s horrible.