As the clever title implies, patch 4.3 will soon be tested on the PTR.
The complete notes can be found here: http://us.battle.net/wow/en/blog/3608419
A few spots are missing information, particularly mages, but there are some goodies available to commence QQ or celebration.
Patch notes for PTR builds are subject to much change, so don’t shoot me if none of this applies with the next test release. I won’t cover everything, I’ll focus on the general and fun/WTF stuff.