This is good news for Sony I guess. Like Insomniacs, maybe Sony were afraid Sucker Punch would would go multiplatform.
This is also good news for gamers if this means a bigger team and a bigger budget for all of their future games.
So as of now, they have six first-party devs who all have and probably will make multi-million selling games: Polphony Digital, Santa Monica, Naught Dog, Guerrilla Games, Media Molecule, and now Sucker Punch.