I think bulldozer will do well in multithreaded apps, like Cinebench.
I wouldn't buy one as a gamer though, unless the quad core can run with the i5-2500k, once they're both overclocked there wouldn't be much point in switching to BD with Ivy Bridge coming to 1155 a few months after bulldozer releases.
AMD is so far behind right now they're almost releasing on Intels tick, which means most likely Intel will get their tock (haswell 22nm) out about the same time bulldozer brings out their bulldozer 22nm revision.
All that said the imo for mid/high end gamers Intel has the chip to beat at $220. If you're looking to price vs performance and your only focus is rendering and other multithreaded apps the eight core bulldozer might win out, leaving the i7-2600k a sort of "hybird" in the mix. With gaming performance of the i5-2500k, while offering better multithreaded performance than the i5-2500k. Whereas a eight core bulldozer chip is going to be crippled in most games since most are dual or tri threaded.