David:
My sources say don't expect a "Digi 002" anytime soon - if ever. I too, would like to see a firewire version, and the ability to use two or three of them at once on a single CPU, but it doesn't look like that's likely to happen anytime in the foreseeable future - if at all.
As far as increased track counts, I have heard absolutely nothing. I'd be happy with 32 tracks and / or the stereo tracks counting as "one" track instead of two (IOW, 24 stereo OR mono tracks). esides, isn't there some sort of a glitch in the program that allows you to get more than 24 tracks if you do a certain something while creating new tracks or something? Seems I've read rumors about that (and before anyone asks, I have no idea how it's done...)
On a much brighter note: Win XP support IS coming! I saw an MBox on a XP system at NAMM. It's not coming out next week (or even next month) but according to the Digi people I spoke with, it should be out by spring or early summer at the latest.