There are no patch notes available yet; however, they will no doubt be made available within the next few hours. But really, the patch notes are not going to deviate a terrible amount from the PTR patch notes, so this evening is a good time to familiarize yourself with everything.
The patch will also bring with it some rather significant extended maintenance as well.
WoW.com has compiled everything we've written into a very large and complete patch guide, WoW.com's Guide To Patch 3.2.
Enjoy the patch, folks!