As one of the fortunate few with a Mists of Pandaria beta invite at this time, I have been excitedly snapping screenshots of some of the UI changes coming in the next expansion. While we still have not yet seen the Pet Battle system interface, arguably the biggest UI reveal this go-around, there are still a few tweaks to the game that are deserving of being pointed out. More quality of life improvements than anything, the changes to WoW so far in the Mists beta have been straightforward and welcome additions.
I figured that since this is the beta process that we as a community can provide some feedback even if you haven't had a chance to see these tools in action. Since the tools are mostly quality-of-life improvements and not "boots on the ground," experience-dependent changes, these changes are something we can discuss and hopefully make better before the launch.
Since this is the beta, things can and will change dramatically. This is only a quick look at some of the features and changes coming in Mists of Pandaria. As new features open up, like the aforementioned Pet Battles, I will be more than happy to show them to you. If you are in the Mists of Pandaria beta and want to help me out with some UI testing and screenshots or you're an addon developer looking to talk about your new Mists of Pandaria addons in the works, send me an email at email@example.com.