Also on February 10th, the BlackBerry 10.2.1 update will rollout in earnest for the AT&T branded BlackBerry Z10 and BlackBerry Q10. The same two handsets will be updated for T-Mobile sometime between February 10th and February 20th. And those Sprint customers with the Q10 will be updated at the end of February.
The above is a tentative schedule, so if there is a minor delay here and there, don't throw a temper tantrum. One of the things coming with the update is the Floating Action Bar that brings the "back button" to your Berry. Betcha' can't wait!
source: N4BB via BerryReview