Why its PS3 only is very odd as it would sell very well on PC, due to being linked into the EVE online universe.
(Wont be on Xbox as you have to pay to play online, could change in future)
Dust 514 is a expansion of EVE- basically their will be a mercenary market where you buy new armour/guns/tanks etc this is all made by the players in EVE.
Contracts are made by the EVE players to the dust merc corporations to accept- also another link up is a planetary bombardment which happens via a ship in eve firing onto the battlelfield.
Overall what CCP games is trying to do is bring consolse into the EVE universe which is a single shard- everyone in the world bar the chinese on one server for the PC/MAC space mmo.
How successful the game will be, thats going to be interesting to see as a AAA Free FPS is pretty unique to the console market.