Patch 4.0.1 just hit the PTR( the regular one, not beta server)
Biggest changes are new class changes, new skill trees and new glyphs.
Changes in Kalmindor/ Eastern Kingdom, new Cataclysm quests,Archaeology, flying in Azeroth, guild leveling and new graphics aren´t avialable. Level cap is still 80.
But on the bright side, this means that Cataclysm isn´t that far away.