Yes, PC users will be able to use the PS3 controller interface. I don't have a link, but this was confirmed in a number of interviews.

Edit: Relevant quote from the Gameswatch interview:

G: I see, so the one we’re seeing now is Mouse+Keyboard UI?
Y: Yes, there is also something called gamepad mode and PS3 will be for that. For PC you can also choose the gamepad mode.