If you take a detail look, you'll find all MOTOBLUR-equipped phones are currently stuck with 2.1 (or worse, 1.6). Clearly Motorola hasn't had time to update MOTOBLUR to work with 2.2, yet.
DROID is bare Android. DROID X, DROID 2 have a stripped-down MOTOBLUR.
I do think the CHARM and some other MOTOBLUR phones will hit 2.2 in due course, but given Moto's track record, 2011 is the earliest I agree that.,