Just tried the latest Alpha and looks really good. I like how the stance/presence is now on the right and side of the button bars instead of on top.
Did find the following issue with regard to the pet bar.
1: activate pet. (pet bar shows on top of main bar and is correct)
2: mount. (pet bar disappears as expected)
3: unmount. (pet bar reappears correctly)
4: mount again. (pet bar disappears as expected)
5: attack target forcing a dismount, I used Icy Touch in my example. (pet bar appears but all buttons are blank. Pet activates and attacks) - see attachment screenshot.
Let me know if you want me to try anything else.