...PS4...
ok lets start
Technical Details:
- Features 8GB of GDDR5 ram, 8-core x86 CPU
- GPU can be used as a GPGPU
- Supports Unreal Engine 4
- Features a secondary custom chip for background downloading and uploading even while gaming
- Dedicated video compression hardware so that you can upload recordings of gameplay using the Share button on the controller
- Additional camera utility to sense depth
- Touch-pad
- Share button (for social interaction, can broadcast the game with a press of a button (support for UStream as well), friends can post comments, developers can insert command buttons where friends can drop certain items for you
- Light-bar (to identify players)
User Interface:The user-interface is said to feature "personalization" with tailored content as the PS4 gets to know your tastes. There is support for various video services such as Netflix, Hulu, Video and Music Unlimited, Amazon Instant Video, Cinema Now. There is also Facebook integration with the PS4 although we do not yet know the extent of that.
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Gaikai/Cloud:PS3 titles are not natively supported on PS4 but they are exploring the possibility of accessing PS3 games with the cloud on different Playstation devices. Thanks to Gaikai, Sony says that games can be accessed instantaneously. They also expanded this concept to Playstation and Playstation 2 games, as well as across multiple platforms.
Users can also spectate their friends' games, help them through levels, and even be given control of the game and play it themselves.
Remote Play:Support with the PS Vita. Every PS4 title to be playable on the Vita. Transmission times reduced from Remote play on the PS3 so there won't be as much lag with help from Gaikai.
Release Date:Holiday 2013.
Games:- Developer list for the Playstation 4
- Killzone: Shadow Fall
- Knack
- Drive Club
- inFAMOUS: Second Son
- The Witness (Braid dev)
- Deep Down (working title, new IP from Capcom)
- Watch_Dogs (multiplatform, Ubisoft)
- Diablo 3 (PS3 and PS4)
- Destiny (multiplatform, Activision)
thanks everyone
and if anyone want to add something go ahead
maybe i forgot something 
Have a nice day
