Sony has officially revealed Uncharted 3: Drake's Deception. IGN and Kotaku both have an article for it. Seems like a good idea, I imagine sand storms and walking in a lot of sand is going to be a pain though. Here's the link:
http://m.ign.com/articles/1139326
Also, this does make me wonder what Sonys big reveal will be this weekend as that was my guess.