The exclusive's gonna be hard to guess... He didn't come with all that many accessories back in the day so it won't be something like that... What says "desert"? I doubt it will be an RPG or LAW (that will come with the eventual Footloose anyway, I imagine).
The Coyote is a good bet, I suppose. Maybe one of those shemagh things that are all the rage these days?
I assume someone suggested an RPG because he fired one during the opening of each episode of Season 1 of the cartoon. The preview shows him wielding all the eqipment the vintage figure came with so the exclusive accessory really could be anything. Snake Eyes and Beach Head have shown they can really come out of left field.
I'm still thinking an uncamoed head sculpt.
No old Warsaw Pact RPG, but LAW would be cool; as I mentioned in the Flint thread, the reason I prefer Snake Eyes, Duke and Beachhead (and mostlikely Dusty) over Flint is that those guys are loaded for bear.
Purely speculation at this point, but speculation is fun. Dusty should / will come with:
-FAMAS with scope, muzzle suppressor, and what looks like a foregrip. I think we don't get the bipod.
-Extra mags for the FAMAS
-Sidearm (c'mon Sideshow, give him a DESERT Eagle
)
-Extra mags for his sidearm
-Frag Grenades
-Smoke Grenades
-Combat Knife
-A Camelbak Water System would be nice; he's out in the desert fighting and is it's easier to hydrate on the run with the Camelbak.
And it looks like he comes with a regular backpack and a fannypack as well.
EDIT: How could I forget the helmet and goggles?
Things I'd like to see (which would be icing on the cake / gravy, whatever you prefer)
-Some Claymores!
-MREs to stuff in his pack.
Man, I'm stoked to see Dusty.
DO NOT WANT! 
Then you won't be elite! 
