Also, the latest news say that Cataclysm came out and its not 4.0.0, its 4.0.1, but I guess that doesn't matter to developers. Oh wait, you already started creating the novos easy emu. Well, I guess you have to make it work with the new client now.
Blizzard released only 4.0.1, so your 3.3.5 clients will update to it.
4.0.0 was the BETA, you know, buggy as hell.
And yea, PHandels is right in every way, just sit back relax and wait.
Cheers !