Sony has passed through a new update for the Windows PC version of the PS Now application, now enabling users to use their DualShock 3 controllers with full functionality.
Previously, gamers could only use the PS4’s DualShock 4 controller to play games via PS Now. As it stands now, however, players will be able to use their DualShock 3's as they would have done on their PlayStation 3's for games with SixAxis motion support.
As I've tested it out, it seems as though it's only able to work with a wired connection for now.