They've changed the UI a bit again, and it looks like we'll be getting new racial backgrounds. Currently it's a bit bugged and only Orgrimmar is showing, but I imagine each race will have their own in a similar style.
The customization previews have larger boxes now, and you scroll down through them. These are still rotatable with your mouse.
Then, the best feature in my opinion, is that they finally allowed us to zoom in when choosing face/hair/etc. The camera pans in as soon as you go to select those traits. I've wanted a zoom in option for a long time as it can be hard to discern face details on some models when they're zoomed out so far.













