The four minute long trailer starts off in a desert scene with some crazy looking biker guys that remind me a bit of Borderlands, but then proceeds to show a huge battle between floating sand barges. It looks a bit like Star Wars: Return of the Jedi during the Jabba scene in the desert, complete with laser blasters and explosion. Sadly there's no giant slug like creature, that's been replaced with a giant spider with bad breath.
If anything this trailer, and all the others, show what a nice variety of environments there's going to be in the sequel to a game based almost entirely in a snow world. May 18th should be a day co-op gamers mark on their calendar.