The new UI shots that got seem like they were taken very early in the development for the healthbar. And the fact that we are not shown a group or raid interface tells me this is heavily subject to change, so good news
I'm really forward to discovering the new zones, updated models for the gnolls, centaurs and tuskars in action. I'm loving the fact that they are revamping the fly system with this dragon riding. I hope it will be a good success that they will be able to use to implement an equivalent of it around the whole world of Azeroth and beyond.
The new race looks hideous (sorry for the harsh feedback) but I'm not sold at all. When I'm picturing a dragon race, it is bulky, it is massive and you don't want to get close to it because of the danger it represents. This one I don't want to get close to because of its looks. If they add options to make it fierce and intimidating, stronger silhouette and more menacing poses then I will be sold. I'm greatly looking forward to some more gameplay footage and details on the specs.
The reworked talent system can be a great breath of fresh air but the fact that you can save your trees and have a multitude of them is not very reassuring to me. This just feels like they are giving up to the people who raged over the covenants soulbind switch limitation. Constraints are healthy and I'm not looking forwards to swapping talent trees between bosses. I know it's very early, we haven't seen anything but I feel better expressing this now.
The cinematic was a bit peculiar, I really didn't get what they were going for but I liked it a lot that they went back to a more poetic narrative direction. The dragons are pretty quick to hear the call I must say ^^
Other than all of this, the logo is disgusting (harsh feedback sry again), I'd rather have the team move to a flat design, legion had it right.