Sheryl Lee (Laura) and Dana Ashbook (Bobby) are coming back to the show as well.

http://www.slashfilm.com/twin-peaks-season-3/

The article says that the character Audrey is also set to return but I wonder if Benjamin Horne, Donna and James  are coming back? What about Shelly? I’m sure we’ll get the whole “Twin Peaks” gang. I wonder if Sheriff Truman is gonna return too?

Kev