And it's just a guess.  No one knows when any update for any phone on any carrier will be released.  All we can actually know is once the carrier annnounces that they've started sending out the updates, that they've started.  The day before that it still guesswork.  (Even an announcement that they're going to release it tomorrow is only 99+% certain.  If they find a bug at the last minute, they'll hold off.  [Google actually pulled one recent update - after it was released - because of a bug that wasn't discovered until after it was released.  So even the fact that an update was already released is no guarantee that you're going to get it.])