If you look a little ways down the page, you'll find that there's a thread on this exact issue. :P That said, if all goes well, there will be a hotfix issued before Tuesday and you'll hopefully get your mount with it.

Yep. :)

Once that goes live you should be awarded the mount/pet you qualified for with the achievement as soon as your character logs in.

Any word on Tournament mounts? I earned them a while ago on horde side and then changed my faction prior to 5.0. I now have a few AT mounts on my horde, but not others. (Missing the ones like the skeletal warhorse, wolves, etc.)

No, I'm afraid not. This is only about those mounts/pets that you receive through achievements.