The 4.3-inch Xperia Acro S has a 1280 x 720 display resolution, but will actually launch with Android 4.0 Ice Cream Sandwich, unlike the Xperia Go. It'll also be PlayStation Certified. Looking at the rest of its specs, including the 1.5GHz dual-core processor and 12-megapixel camera around the back, it looks to be very much a direct match to the Acro HD model already introduced in Japan.
Sony announces water-resistant Xperia Go and Xperia Acro S for Q3 2012 | The Verge
https://youtube.com/watch?v=hF8DFhnYyUE&feature=player_embedded
Sony announces water-resistant Xperia Go and Xperia Acro S for Q3 2012 | The Verge
https://youtube.com/watch?v=hF8DFhnYyUE&feature=player_embedded