|Review of Aff tree:|
black = improves
green = pvp
blue = boring
Mastery won't come into effect until approximately 75, when you train for the passive talent. You'll find it on level 78+ items, probably only in cataclysm zones(?). We'll stack it like hit on our gear, heck, maybe instead of hit.
Personally, I like what I hear. Remove the Grim Reach-type talent points and make them passive specialization buffs. Remove the Improved ____(Corruption/Fear/Life tap) type spells to thin down the tree. PVP-ish skills like Fel Concentration could easily be removed as a buff. It also sounds like (IMHO) that they'll remove some of the "must spend 5 points in affliction to get ___" limits. Leveling up a new lock should be easier as once you choose a tree, you'll focus on it. No longer spreading into Destro to get improved shadow bolt or demo to get better health stones.