Speaking to PC Gamer, Carmack discusses the challenges with programming for consoles with multiple processors: "they can quote these incredibly high numbers of giga-flops or tera-flops or whatever, but in reality...they're significantly slower than a modern high-end PC." Carmack has made a living in the PC gaming field, so naturally's he is going to be a bit biased, but he still praises the PS3 and Xbox 360 for their graphics systems.
That said, Carmack does call the Xbox 360 a "really sweet development system," noting that Microsoft's recently-launched console "will probably be id's primary development platform" - so if you are a console gamer who has to get his or her Wolfenstein fix, rest assured it'll likely make it to the Xbox 360. Let's hope, though, that they get more accustomed to fixing some of the lag issue found in Quake IV.
[Update: fixed a typo or three.]