Note: you can see a full updated list of all 5.2 hunter changes here.
Just a heads up that we have an approximate release date for patch 5.2: it is likely to land in about two weeks on Feb 26th, according to Bashiok. This was a topic of speculation on the podcast last weekend, and of course just after our guessing we get an official(ish) date.
As is always the case with WoW release dates, the patch 5.2 date is not set in stone. Bashiok specifically said that, as always, things can happen to slip that up. However, it is pretty safe to say that patch 5.2 will not land before then, and is very likely to be on Feb 26th.
So now you have a timetable for all your 5.2 prep work!