My guess is next week or the week after. Hoping it's next week. Sprint is scheduled to roll theirs out Feb. 16th and ATT already rolled out.
I'm already beginning to "prep" my phone for the update. Back everything up, delete apps I no longer use. and general housekeeping.
I will do a factory reset after the update. And having deleted the apps I don't use, they will not auto-reinstall after the factory update.