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Today's Tech: World's first 4K OLED TV, Valve outs 'Steam Box' prototype, and Sony Xperia Z hands on

It's was all hands on deck over at CES today, with the blockbuster announcements coming in thick and fast from Las Vegas. The most obvious showstopper came courtesy of Sony, who teased a prototype 56in OLED 4K TV - the world's first to combine the two next-generation display technologies.The Japanese consumer electronics giant also added 55in and 65in models to its Ultra High Definition (UHD) lineup, which should mean that deep-pocketed consumers are able to start enjoying UHD at home sooner rather than later.

Sony's mobile arm also turned heads this Tuesday, unveiling two new additions to its popular Xperia range. We took the opportunity to get hands on with the Xperia Z and really liked what we saw - the 5in device packs some impressive specifications, not least its 13-megapixel primary camera. The handsets are also hugely aesthetically pleasing, and may even be the "prettiest phone at CES" according to the crack team reporting from the ground. There's plenty more to discover about the latest and possibly greatest Sony smartphones, so make sure you follow the above link to find out more.

If Sony didn't steal the show today, it's only because CES gave Valve the perfect opportunity to debut its potential 'Steam Box'. Ending long running speculation over the development of Steam-powered hardware - at least for the time being - the game development firm and its new manufacturing partner, Xi3, revealed the fruits of their collaboration to be a project codenamed Piston. Looking every bit like the mythical 'Steam Box' we've all been anticipating, Piston works a bit like a set-top box in bringing the PC gaming experience straight to your living room. That means that it could soon be in direct competition with traditional consoles, setting up a fascinating showdown in the gaming industry throughout 2013 and beyond.

Away from the bright lights of Vegas, consumer electronics stalwart Samsung has predicted a fifth-straight record profit for Q2 2012. Apparently, its catch-all approach to smartphone production continues to work wonders, with the South Korean firm expecting an operating profit of some 8.8 trillion won for the period October to December 2012 when it issues a full earnings report later this month. That equates to over £5 billion, with the company's success attributed largely to its pre-eminence in the mobile market, where it is reported to shift nearly 500 units every minute.