There will be realm maintenance this Tuesday from 3:00 a.m. PDT / 6:00 a.m. EDT until 11:00 a.m. PDT / 2:00 p.m. EDT. The maintenance should not be any indication that patch 3.3.3 is going to drop, as it just went on the PTR -- so don't expect anything.
The full blue announcement is as follows:
If the maintenance becomes extended, you'll hear it here.
Oh wait, is that some new fancy blue quoting CSS stuff on WoW.com? Why yes, yes it is.