These images popped up in a forum called iAndroid, with some details. From the information on the display, we can make out that it will have Gingerbread, 720p display (probably 4.3 inch), front camera, rear camera, 1GB RAM. It is said to be running a 1.5GHz dual core processor, but that punch is not visible in Quadrant results.
LT26i is rumored to be dubbed as Xperia Arc HD, but there is still no word on the launch. We would expect an announcement by the end of the year, but we would bet no money on that.