No mount yet. I did get the bag, the banner, pet, hood and cloak.
I really hope I get the hearthstone and backpack transmog.
Grab the weak aura timers. It tells you what zone it will be up in. Than wait a couple of min for it to spawn it will be a big yellow portal on your map. Wait for the mob to spawn and kill it.
Because you get a higher chance once per day I would start out as soon as possible.