I know it seems a bit too soon, as we're still working our way through the last patch, but Blizzard are already pushing patch 5.3 out onto the test realm. Lots of new features are reported, although please bear in mind there is no guarantee any of it will reach Live realms.
You can review the patch notes here.
One thing I've not seen on the patch notes, but has been reported by those on the test realm, is that Hunters may finally be getting more hunter pet slots ... allowing them to have up to 55 pets!
Also noted was a new mount (above) and the possibility of being able to have 3 specs saved on a character, rather than just two.