I'm not too thrilled with the beta. I probably should thank blizzard as I think they've finally kicked my wow habit. If I stick around I'm pretty certain I'll be going back down to 1 account from 8. I definately will not play either of my healers again.(priest or shammy). Some felt BC was the tank shortage expansion despite druids and pallys being made more viable, but I think in Wrath it will be the healers that vanish. Once I've got my 5xshamans and pally+4 shadow priest groups to 60 (stuck at 41-43 now) I was planning to gift level a warlock and druid to 60 and hunter to 60 as the only classes I've never played past 20-30, and see if any of those will revive my interest. I was excited to try the death knight but after a few weeks in beta that wore off fairly quick as well.
I just want to see new content but blizzard seems to be bent on making wholesale changes to the game with each expansion and it is growing tiresome for me at least.