Kenny Stills is the Saints WR3 until further notice. Right now, the rookie from Oklahoma would get the first call in nickel packages. Veteran Steve Breaston likely will press him for the spot once he's acclimated to the offense, but Stills has a significant lead at this point.
Fantasy Impact:
Stills has sub-4.4 speed, so it makes sense that he would fill the Devery Henderson/Joe Morgan deep threat role with Morgan sidelined.