There's been hints of a Windows Phone 7.8 update looming for the AT&T-spec Lumia 900, but little sign of a real timetable. As it turns out, owners hoping to move beyond 7.5 might be satisfied very quickly. Engadget has obtained an AT&T memo that claims the upgrade is rolling out on January 30th -- as in, tomorrow. We don't see any tweaks mentioned beyond what Microsoft itself said last year, although any update would most likely include Nokia-specific extras on top of the official package. We've reached out to AT&T, Microsoft and Nokia, and we'll let you know if they provide tangible details. Whatever their answers, we'll know the truth before long.
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