These are the pictures of dummy iPhone 6 and iPhone 6 cases displayed at several booths of Hong Kong Electronics Fair. Though a size comparison cannot be done from the picture, but from the looks it seems to be of a larger screen size and gives a depiction of a thinner phone. The power button is on the top right side, location for front camera, ambient light sensor, ear speaker and home button are same as iPhone 5S. On the rear is the camera which is again at the same place but the flash is round again.
The site also has a video, which in the starting shows the size comparison of three phones, though it is not very clear to read the names of these phones, but it seems to be iPhone 5s with the soon to be launched two versions of iPhone 6. The video then focuses on the iPhone 6 dummy and the case, which has a I6 written behind it.