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It's very hard to predict what will happen in WotLK regarding balance. I mean, even now skill plays a major role in determining a winner, even slight changes in talents and skills may shift who's "best". And it's also important to note, it's not a class that's good in PvP, but setup - unless you're referring to soloing explicitly or going into PuG BG's in which case it's all random roulette.
It's a definite yes that underperforming specs and classes are getting buffs - holy paladins getting more instant options; retri paladins more scaling, burst and strategic tricks; enh shamans less kiteability, locks easy-to-get soullink and more mobility and so on. The best performing classes seem to get very little on the other hand, namely rogues and warriors - mostly things that will help with their pvp offspecs like mutilate or fury. This leans toward assumptions that while best will remain good, worst will become good also. What works now should work in future, but a lot that doesn't now - just might.
If I may suggest, play a class that: a) you like to play; b) will fit in setups you may make with your friends, c) is performing at least decently in those setups today. And if you don't arena with friends, well take a rogue. I doubt scaling for them will be any less than it already is and so you will fit in abundance of different setups should higher end gear kick in.
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