No multiplayer was a complaint about MP1, so they addressed this. I see no point in it, but I do like it when companies listen to fans.
"BUT like hinted at above, I don't get how it will work? Prime doesn't have "normal" FPS controls unfortuently. It's based on a 'lock-on' system. How much fun can deathmatch be when you can lock onto someone and kill them without even trying? Well.... we'll see I guess. "
Thing is, all of the weapons in metroid are delayed, you can do the dodge move, so there is still skill involved, just as much as when you fight a boss. I doubt Retro will let this out with a problem like that dogging it down.