Newsfactor has a story about Firewire 2 (1394b) and Apple. They reveal that 1394b will not be available as soon as thought:
"If I were to venture a guess, I would guess that Apple will include 1394b as soon as silicon is available. Apple's history as an innovator, and its commitment to FireWire would support this supposition," James Snider, executive director of the 1394 Trade Association, told NewsFactor.
Rumor has it that Apple will introduce new professional desktops at July's Macworld Expo in New York, paving the way for a FireWire revision. But Apple may not be able to finalize 1394b silicon in time to ship the systems by July.
Snider told NewsFactor that the necessary silicon will not be available until the "end of the summer at the earliest."
Which means that Firewire 2 might not make it into new machines... or that new machines won't be available for some time after MacWorld NY.