Sony is being pretty tight-lipped when it comes to revealing too much information about the upcoming PlayStation 4. Sony has yet to confirm the release date or the final design. However, back in February, Sony did show off a developmental version at its event "PlayStation Meeting" and revealed a lot of the specs. A finale PS4 design is expected before E3 2013 in June.
Sony recently confirmed the PS4 will see a "holiday" 2013 release, but did not confirm the actual date or their international rollout plan. Japan and the U.S. should have priority but due to "complexities" in distribution, Europe may have to wait a little longer.
As far as PS4 specs here's a list of expected under-the-hood improvements.
Single-chip custom processor
CPU: x86-64 AMD "Jaguar", 8 cores
GPU: 1.84 TFLOPS, AMD next-generation Radeon based graphics engine
The PS4 is also expected to have a Blu-Ray player as well as DVD compatibility, along with free Bluetooth and Wi-Fi capabilities.
As for the PS4 price, no one knows. However, the UK has already started taking pre-orders. Apparently 20 euros will guarantee you a PS4 when they are eventually released around Christmas 2013 [maybe months into 2014 for the U.K.].
Also confirmed at the PlayStation event back in February, the PS4 will feature a "share" button. The extra button on the PS4 controller allows players to share video clips and screen shots. However, Sony also mentioned developers will have the option to block the "share" button on a game-by-game basis.
Stay tuned for updates on Sony's PS4 release date, price and full list of specs.