Rumors had been circulating online about a PlayStation Now download feature that would allow PlayStation Now members to download and play games off their systems rather than through streaming. This rumor began when a Download Game option accidentally appeared in the PS Now menu, which clicking on had no effect.
Recently however, an inside source had reported to Kotaku UK that a PlayStation Now download feature would be released at the end of September. According to the source, the download option will first be limited to PS4 titles. Games can be downloaded and played offline, and on any account, as long as the games are being played on a PS4 that is set as the primary device, with an account that possesses the PlayStation Now subscription.
Sony has not confirmed nor denied the PlayStation Now download feature, nor was it mentioned during their E3 Press Conference.