It is 2.2, just some are upgrading FROM 2.1.
First impressions / notices:
- default settings for home/menu/back keys are that they cycle off quite quickly and no more haptic feedback from pressing them (yay for silent usage)
- audio improved big time, I think largely due to both stereo channels being piped out of the internal speaker, instead of just 1 channel, but it's more than that, the audio range is a lot better now... it's still a tinny crap speaker, but software will never fix that
- front camera works in the camera app