Spoilers ahead, as well-- these guys are pulling out all the weapons from Zul'Aman, so if you don't want to see what all the new drops look like yet, don't look now. If you want to know what I think, I'd rather see this stuff in-game rather than diving in with the Model Viewer-- it's like reading the last page of a brand new novel, in that you might not know exactly how you get there, but you'll already know just what it looks like. The bear mount above isn't that big of a spoiler-- we already know it drops from. But the weapons and armor-- a big part of me wants to wait and see them in Zul'Aman itself.
Still, if seeing the patch laid out in screenshots is your thing, both MMO Champion and World of Raids are going at it, and I'm told we'll be diving in later this evening. 2.3 ahoy! Go test those bugs on the PTR so those of us on the live realms can get it quick!