PlayStation App 3After playing with the PlayStation app for a few minutes I have found that it allows you to connect your PS4 to your device (including instructions since it seems like a few steps must be taken). You can go to your friends list and see who is online and what game they are playing, you can also send friend requests to people via the PlayStation app. Once you have had your friend requests accepted by everyone you can go and compare your trophies with people on your friends list. You can view any live feeds or recorded videos that your friends with a PS4 may be/or have recorded. The PlayStation app even allows you to launch the PlayStation Store in a browser window so that you can buy PS4 games and have them download to your PS4 without you even needing to touch your console.
Shuhei Yoshida claims that the PlayStation app can go above and beyond what is mentioned by allowing you to send messages, including voice messages to friends with a PS4. He also claims that you will be able to use the PlayStation app on your device as a second screen for several games on the PS4. We will be updating this article at some point on Friday 11/15 (PS4 Launch Day) to let you know whether these claims are true.