Here we go, Patch 4.3 has hit the Public Test Realms, and MMO-Champion has gone crazy datamining as much as they can, including loading screens, skill details and world maps.
Editor's Spotlight
Lots of information is about to be revealed, and not all of it is going to be reliable. The problem with datamined content is that it's based on early beta-level stuff, so a lot of things might change, or just be flat-out wrong. I'm not looking too closely at class changes in particular, since it might be incorrect the very next PTR patch. The actual content is interesting though, lots of pretty images, and lots of new mounts and pets coming!
Links
MMO-Champion - MMO-Champion datamining details