I'll definitely be playing, most likely playing several Horde characters on an RP server and then an alliance character or two on a PVP server.
The RP server has its own problems. Too much of the roleplaying is, well,
awful: people who think that appending "mon" to the end of every sentence equals roleplaying a troll, or people who think that orcs have to talk like Cookie Monster. "Me get killed by big scorpion! Me dead now!" Argh!
But worse than them are the roleplay police, where you get conversations like:
[Agzax]What level should I be before trying the Wailing Caverns quest?
[LordOCD]Please review the standards for this RP server.
[Agzax]Huh?
[LordOCD]This is a roleplaying server. Do not engage in out of character dialogue here.
[Geniusboy]SHUT UP YOU $@#! I CAN TALK HOWEVER I WANT!
[Ghandi]Try level 15
[LordOCD]I'm going to report you to the GMs. We want to be able to enjoy a good rp experience here. Are you mentally defective or something?
[RandomTauren]Mooooo
[RandomTauren]Mooooo
[RandomTauren]Mooooo
[RandomTauren]Mooooo
[RandomTauren]Moooooooooooooooooooooooooooo
[Agzax]Thanks, Ghandi!
Makes me craze, it does

. Still, it's better than a lot of the just awful and obnoxious talk on the non-RP servers, and occasionally you'll encounter someone who can stay in-character without constantly hamming it up.
And fortunately, it's real easy to leave the chat channels. At this point, I only log into them when I have a specific question; I ask it in the least-statty way possible; once I get my answer, I thank whoever helped me and leave the channel toot sweet.
Daniel