Sony CEO Kaz Hirai had some good news to deliver on stage at D11 -- for US fans, at least. According to Hirai, the Xperia Z, which currently serves as the company's flagship smartphone, is expected to arrive on a US carrier shortly. Unfortunately that's the extent of the details Kaz was willing to offer up, as we expect he wants to give the unnamed operator the opportunity to make the announcement for themselves. With that said, we have our suspicions that T-Mobile may be involved,