Well I've been one of the $399 PS3 doubters, but I'm prepared to admit that there's now a chance this may be true (and still a chance it may be false). This could in fact give the PS3 a decent holiday season.
Still, with this, I doubt Sony will ever profit on the PS3's sold so far. Basically they're just fighting for marketshare in the hopes that it'll pave the way to sell more PS3s later when they're cheaper. I'm still not convinced that's a viable strategy since so far all they keep doing is skimming the top off of the market with the mainstream buyers still way below their price. The Wii is going to tap the mainstream first, with the 360 pretty far behind it and by the time the PS3 gets to that price range they may be too far behind to recover (and they may be that far behind already).