Sony continues to experience its non-Ericsson (pending regulatory approval) lineup of smartphones with Sony Xperia NX and Sony Xperia arco HD. The handsets have been announced for the Japanese market and are spin-offs of other Sony models. The Xperia NX is a Japan-bound Sony Xperia S and features an identical spec sheet. The Xperia arco HD is the followup to the original Sony Ericsson Xperia arco. It earns its HD tag from the inclusion of a 720p Reality Display, the same featured on the Xperia S and Ion. Other features include an infrared port, NFC mobile wallet, and mobile TV support. Both devices will be available come Spring, but it looks like there are no plans to bring them outside of Japan.