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"Sony has released a fourth teaser video on its YouTube channel to build up hype ahead of this week&amp;#039;s PlayStation press conference. The latest - and presumably the last - of Sony&amp;#039;s evolution of PlayStation retrospective takes a look back at Sony&amp;#039;s handheld systems with the PSP and PS Vita.  Sony is widely expected to unveil the PlayStation 4 at its February 20 press conference, with images believed to be of prototype controllers for the console recently leaking online. The peripherals appear similar in design to the standard PS3 controller, except with a touchpad at the centre and a light at the top that is expected to function in the same way as the orb at the end of the Move controller.  Details on the hardware specs for Sony&amp;#039;s new console were recently leaked along with reports that the system will feature 4K resolution support in line with a rumoured new range of Sony TVs. More recent reports suggest that the console will have the ability to stream full games thanks to the cloud technology Sony acquired when it bought Japanese company Gaikai. Gallery: 12 PS4, new Xbox games we can expect:  "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/gaming/playstation-4/news/a459830/playstation-4-latest-video-teaser-looks-back-at-psp-vita-watch/>