Sony unveiled the Xperia Z just hours earlier over in Las Vegas, but UK retailer Phones 4U has already announced that Brits will see the phone at the start of March. Excited "omni-balance" fans can pre-register (that is, sign-up for email updates) on the phone-seller's site starting today. The press release adds that it'll arrive across "a range of networks". In fact, Vodafone's told us directly that it'll definitely be selling the new flagship, although it hasn't followed Phones 4U's posited date -- we're still waiting for official confirma