Inveterate priest fan that I am, the first thing I did when I got my hands on this was make a build for my holy priest, and this is what I came up with: 14/57/0. Yes, I'm finally excited enough about Holy to spec away from Improved Divine Spirit; Guardian Spirit just looks too good to pass up, at least in its current form. As far as my Rogue goes, it depends on how Murder Spree ends up working, but I'm thinking either 21/50/0 (Cold Blood combat, yay!) or 20/51/0. Death Knights I still can't quite get my head around, but it sure is fun to play with their talents.
For some of you, it may strike you as a little early to be thinking about your level 80 talent builds - especially given that Wrath is still in alpha and everything we think we know about it may change - but I say, it's never too early to theorycraft. That is why I'm pleased to report that Wowhead, having gotten a chance to play some Wrath at WWI, made talent calculators for the Wrath alpha talents, including Death Knights. Now we can play with our shiny new builds to our hearts' content. Paladins and Hunters have not had their talents implemented in the beta yet, so you won't find them there, but I'm sure it's only a matter of time.