Thumbnail images of a new Sony Ericsson Z780i have been reported by semcblog today. With an addtional evidence of the Z780 device profile on Sony Ericsson company website, the Z780 should be announced soon.
From the little thumbnails we can see there are only some minor changes on the design compare to Sony Ericsson Z770. The external LCD screen at front panel is a bit more squarish, the back cover is also different with Sony Ericsson logo at the bottom.
While minimal information is available at the moment, some suggests that the Z780 will support video calls with its HSDPA connection.