Rust has been assigned to AHL Wilkes-Barre/Scranton, the Penguins' official site reports. Rust's demotion arrives on the heels of the team's addition of Mark Arcobello, who had been waived by the Predators. Rust, who recorded two points in 14 games with the Penguins, has notched 10 goals and 14 points in 24 contests at the AHL level this season.