The Remote Play app essentially allows you to use you to mirror your PS4 on a phone or tablet over Wi-Fi. With this release, even non-Xperia Android device owners can download this app and enjoy their PS4 games on mobile devices. Now this is only available in the USA, but we've contacted Sony to ask about its release in other countries.
The expanded Party feature has been teased in previous previews but now Sony is laying it all out for PS4 gamers to get excited over. It allows Sony Xperia users to stream games from the PlayStation 4 console to the smartphone (while you're on the same network) and play the games using a DualShock controller or the on-screen buttons on your smartphone itself. The biggest change has to be the increase in the number of party users from 8 to 16, who will all experience better connectivity and audio experience.
There's also a new Chat Transcription feature for players in the US that will provide accessibility support for US English by converting party voice chat to text or inputting text that's read aloud to other party members via the PS4 Second Screen app on a mobile device.
Players should also be able to now use their DualShock 4 wireless controllers via Bluetooth for Remote Play on an Android, iPhone, iPad, and Mac.
PS4 7.00 system update is being released this week by Sony, with PlayStation 4 fans getting the major firmware download soon.
Update, October 1, 2019: Microsoft has added the Android version of its xCloud app to the Google Play Store. The prerequisite to this feature working is running Android 10, iOS 13, iPadOS 13, or macOS Catalina.