I really think you should check out the ally PVP mount before you do a faction change. I think a lion is way cooler than a scorpion (six eyes don't go well with me).
Thinking more about the Rogue Tier11 gear the idea makes a lot of sense if it's coming from Uldum because as we already know its placed in the desert. The only problem I have with it is the gigantic jewel and flashy colors of the helm, as someone else already observed, it looks more like mage gear than for rogues. Perhaps if they went for more of a rustic look for rogues like in old movies with Arabian thieves it would look a lot better.
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