Here's a website about the "Playstation 4 secrets" and what will possibly be in the PS4, here's a bit that came from the website there's alot more interesting things there:
Technology | PS1 | PS2 | PS3 | PS4 |
Disc | CD | DVD | Blu-ray | Holographic Disc (HVD) |
Audio | Stereo | Dolby Digital 5.1 | Lossless 7.1 Channel | Lossless 9.1 Channel |
Storage | 1MB Flash | 8MB Flash | 20GB-160GB Harddrive | 220GB-1TB Harddrive, Flash, External |
Storage Speed | NA | NA | 1.5Gb/s (SATA-150) | 6Gb/s (SATA-600) |
Color Depth | True Color | True Color | True Color, Deep Color | Full Deep Color |
Color Space | BT.601 | BT.601 | sRGB, BT.709, x.v.Color | x.v.Color |
Controller | Vibration | Vibration | Wireless, Vibration, Motion Sense | Wireless, Vibration, Motion Sense (3D), Wind, Shock |
Internet | None | 10/100Base-T wired | 1000BASE-T wired, Wi-Fi 802.11b/g wireless | 100 Gbit Eithernet wired, Wi-Fi 802.11b/g/n wireless |
Display | SDTV (640x480i) | SDTV (640x480p NTSC / PAL) | HDTV (1920x1080p) | QF-HDTV (3830x2160p) |
VRAM | 1MB | 4MB EDRAM | 256MB GDDR3 | 1024MB GDDR4 |
System RAM | 2MB | 32MB | 256MB XDR | 1024MB GDDR4 |
http://www.edepot.com/playstation4.html