Sony has just announced a couple of new Xperia smartphones for the Japanese market – the Xperia GX and Xperia SX. Both of them run Ice Cream Sandwich, and are LTE capable. The Xperia GX packs in a 13 MP camera, a first for Sony, while the Xperia SX is, apparently, the world’s lightest LTE smartphone. The Xperia GX, in fact, is the long rumored Sony LT29i Hayabusa. Glad…