Mention of the three cubesats to be deployed - implication is that the Slingshot deployer will be used for all three; I didn't realize that, thought there was also an NRCSD-E deployer.
After Cygnus’ stay at the Space Station, the spacecraft is planned to maneuver to a higher altitude where the sixth NanoRacks External Cygnus Deployment Program mission will deploy two of three CubeSats on board into orbit, MySat-1 and the second CHEFSat satellite.