Sony's PlayStation Now game streaming service is coming to Windows PCs [cnet.com]:
PlayStation Now has already been around [cnet.com] for a couple of years on the PS4 [cnet.com], PS3, PS Vita handheld, plus a handful of Blu-ray players and smart TVs. For $20 a month or $45 for three (£13 monthly in the UK, but alas, not available in Australia), the service gives players unlimited access to a long list of over 400 PlayStation 3 games [playstation.com]. (The service is available only in those countries as well as in Canada and Japan, with Belgium and the Netherlands currently in beta.)
Remember OnLive [wikipedia.org]? Sony acquired that company's patents in 2015.
Also involved, a $25 USB dongle to add DualShock 4 support [theverge.com] to systems:
Sony is bringing official DualShock 4 support to Windows PCs and OS X. Today, alongside the announcement of PlayStation Now's upcoming release on Windows [theverge.com], the company revealed a new $24.99 USB adapter that will enable "every feature" of the PlayStation 4 gamepad. It will begin shipping in September. Specifically, Sony says the dongle opens up full access to "buttons, analog sticks, touch pad, light bar, motion sensors, vibration, and stereo headset jack" — so long as those features are all supported by whatever game application you're using. You can already use the DualShock 4 for the basics by pairing over Bluetooth or plugging it in directly with a USB cable, but now the controller's full capabilities will be unlocked.