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The NDA isn't supposed to be over until tomorrow, but they jumped the gun. And they do their testing in Linux rather than Windows, which may affect some things.
The short version is that an FX-8350 can hang with a much more expensive Core i7-3770K in benchmarks that scale well to eight cores. Indeed, you could argue for the FX-8350 on average coming out a bit ahead in those scenarios.
The problem? It still gets crushed by Ivy Bridge in single-threaded programs. Or, for that matter, programs that don't scale past four cores.
AMD is launching the six-core FX-6300 at $132, which is only $10 more than the four-core FX-4300. Six cores at 3.5 GHz with 4.1 GHz turbo should mean you can readily overclock to 4 GHz or so if so inclined. That could make it a nifty purchase for people looking to assemble a new gaming system on a budget. While you don't actually need six cores for gaming, the shared-scheduler architecture means that you can really only half of the cores at a time at full speed, and three cores is definitely better than two. The FX-6300 also has double the L3 cache of the FX-4300.
As usual, if you want a gaming system and can afford it, then you get a Core i5-3570K. But if you can't? Then the FX-6300 looks like a good alternative.