I am hearing that to keep it super-secret no one on the inside knows what it is. Only executives. Instead, they will announce on 2/7 and then give worker bees 90 days to bust their humps to make it work. They aren't telling external software development partners, that's for sure. Not that any of my stuff would benefit.
Given the "industry first" and "magic" theme of the announcement, I'm putting my money on an Android with a Nintendo 3DS-like screen. The fact that RIM already shot their wad at CES, VZW and Apple already claimed their stake, and HP's last gasp for WebOS day is 2/9, there's isn't much left that could be exclusive to Sprint and still be "magical" or "industry first."
--Qfg