Seeing as he is supposedly an extremely difficult encounter and difficult enough to reward a title just for defeating him the only way you can(which is the hard mode), I'd imagine he will probably drop some kind of reward (a mount maybe?) much like Sarth 3D does. Even if its extremely amazing gear, I wouldn't think it would justify farming this guy in itself without such a reward. They havn't really released much info about him yet other than how you unlock the encounter and why he is there, but I also havn't seen any new mounts pve-related outside of the 2 new achievment drakes and the Mmirion (or w/e....the gnome boss) gnomish mount. I'm gonna guess a 310% (or higher?) armored proto drake. Any other speculation?