I wouldn't be surprised if this also came to the PC, but as far as "console" exclusivity (or whatever the hell some fools refer to it as) it's PS3 only due to the PSN being more "open ended" than Xbox Live.
Dug up some interesting information, apparently the most innovative thing about this FPS is it's business model.
THIS GAME WILL BE FREE TO DOWNLOAD OFF PSN AND NO MONTLHY FEE EITHER.
You read that right, also, things like new maps and missions will be free as well. Buuuuuut, there will be a DLC model where you buy ingame armor and weapons with in game money or actual cash , albeit cheaply. (For instance, 0.05 cents for new shotgun, ect.) or you can get the EVE Online players to "financially invest" in you, as the trailer showed.
http://www.ccpgames.com/en/public-relations/press-releases/ccp%27s-revolutionary-persistent-shooter-dust-514-to-premiere-exclusively-on-sony-playstation-3.aspx
Interesting, if Dust actually turnsout to be a quality shooter (doubtful) but if it does, EVE online guys are going to make a killing.