Let the hive mind of Engadget get that for you.
"I just switched to Sprint from Verizon about three months ago for the Pre. Then I went for the Hero about a week ago. Now, I miss my hardware keyboard and am thinking about switching to the Moment. I am still able to switch back to Verizon if I want and get the Droid when it arrives. Should I just trade up to the Moment when it comes out, see if I like it, and if not switch to the Droid? Or something else entirely? Help!"
Is it going to have an AT&T/Rogers GSM/UMTS version?
What about T-Mobile-USA?
The problem with the Novatel Mifi is: no sign of US GSM/UMTS versions, for AT&T or T-Mo. Not even a Rogers one I can import and sneak onto AT&T.