According to the spells attached to it, Thori'dal requires absolutely no ammo. It apparently creates its own and it looks like the bow's DPS is jacked high enough that you'll suffer no loss from the lack of ammunition. To make the deal even sweeter, Thori'dal comes equipped with a passive haste buff that nulls the need for a quiver. Congratulations on your Legendary, hunters! Here, have a bag slot!
I'll admit, I don't play a hunter, but this bow seems like a pretty sweet deal all around. Agility, crit, haste, armor penetration, and free ammo. Just about the only thing it doesn't do is conjure s'mores. Keep in mind, though, this thing is still on the PTR. Any stats or spells you see attached to this bow may or may not be there the day it hits the live servers!
If you want to take a gander at the stats, check it out after the jump!
Thanks, MMO Champ!