#1 - Party Chat works across entire system and all apps, 8 people per lobby, but you can make MORE THAN ONE LOBBY!

#2 – Broadcasting is fast and easy, with “adorable PlayStation-themed standby screen”. Standby screen is activated on screen whenever you switch from game to PS4 OS. During OS browsing, “On Air” indicator is present on the screen.

#3 – Double-tap PSButton to multitask to any app that was last active. Single press gets you back to the OS.

#4 – Play as a guest on another console does not carry on all system settings like on Xbone, but when you log out from guest console, all personal data (credit card info)is permanently deleted from that console.

#5 – Trophy screen shows PS4/PS3/Vita data, but now each trophy shows how rare it is (how many people managed to unlock them)

#6 – “The PlayStation Store is actually organized”

#7 - You can power USB devices while the console is off

This is the summary of the article found on Engadget.

Number 2 and 6 are exciting for me as someone who thought the PSN store on PS3 was horrible in the way they organised things it is hopeful to see that they have organised content better. Also i look forward to broadcasting on the PS4 and to test how easy it is to setup a broadcast.