I'm still very much unconvinced by this system, especially if there really won't be any traditional flying. It just sounds a lot less convenient. I fly to get from A to B. Sometimes A and B may be quite close to each other and doing dumb soars and twirls costs me more time than the higher fly speed may be able to save. Often I fly longer stretches semi-afk thinking about other stuff. That won't be possible anymore if it is as involved as they claim it to be.
My favorite Mount is the Void dragon mount from N'Zoth. I like to fly with this mount and sometimes, i'm hoovering in the air, because something in reality needs attention. So Blizz forced me to fly a mount i don't want to fly and play a minigame all the time i want to fly to fly. Sorry, but i sounds really anoying for me.