We've got our PlayStation 3 dev kits, and we've got our code compiling on it. I do intend to do a simultaneous release on it. But the honest truth is that Microsoft dev tools are so much better than Sony's," said Carmack. "I think the decision to use an asymmetric CPU by Sony was a wrong one. There are aspects that could make it a winning decision, but they're not helpful to the developers."
I expect this generation will see most developers writing their games for the Xbox 360. Then they will either port it to the PS3 or outsource it to another company to port.