Sony announced earlier today that coming this year, you will be able to stream PS4 games using PlayStation Now. While PS Now offers a large library of streamable games, 483 by the PS Blog’s count as of today, it has yet to offer games from this generation.
You can find the official announcement via the PlayStation blog here: PS4 games via PS Now
This is excellent news for the PlayStation platform and for subscribers of PS Now. If you haven’t yet tried the service, Sony does offer a 7 day free trial. Though you may want to wait on that until the PS4 games are offered!