Sony announced today that they are adding PS4 titles to the PS Now library. With those additions (which will expand over time), the PS Now library has now exceeded 500 titles as well.
You can find the PS4 titles and additional details via the PlayStation blog here: PS Now Details
PS Now’s offering continues to expand which is a great thing for fans. If you are interested in streaming PlayStation games and haven’t given it a shot yet, there is a free 7 day trial which you can find here: PS Now 7 Day Trial