Alongside the Xperia Ion and Xperia S, Sony has announced two new smartphones aimed at the Japanese market. The new Xperia Acro HD and Xperia NX are both exclusive to Japan, and appear to be based upon the manufacturer's American and international offerings. The Acro HD is described as a successor to last year's Xperia Acro, while the Xperia NX is said to be an Xperia S variant for Japanese consumers.
So far no images or specifications are available for either devices, but we'll keep you updated as further information emerges.
Source: Sony Ericsson Press Release