It was previously rumored that the PS4 would, at some point, be getting some sort of external music functionality. Well, reddit user, IWorkForSony, who has been verified as an actual Sony employee stated that Sony is indeed working on an update for that will bring MP3 and video player support to the console. The functionality can be expected by "the holiday season". Additionally, IWorkForSony also stated that DLNA media server support is also planned for some time next year.
Lastly, IWorkForSony also confirmed that with the upcoming PlayStation Now service, gamers that already own PS3 versions of the games that will be available via PlayStation Now will not receive any type of discount. Also, the subscription model for the upcoming streaming PlayStation Now has not been finalized. The public beta will serve to test different pricing models.