I do wish everyone would STOP with the bogus claim this iPhone 8 will 'have similar dimensions to the iPhone 7 4.7"' because that's PHYSICALLY IMPOSSIBLE.....aahhhh
Look at the LG G6, with its 5.8" screen:
It is between the iPhone Plus and 4.7" in size, it does not have smiliar physical dimensions to the 4.7" iPhone apart from thickness, it's slightly wider and about a centimetre bigger.
So unless Apple intends to curve and wrap the display around its entire edge including top and bottom it'll be physically bigger. And if they did that, good luck affording one and don't ever ever ever ever drop it!
For comparison, the sizes are:
LG G6: 148.9 X 71.9 X 7.9 mm
iPhone 7 Plus: 158.2 X 77.9 X 7.3 mm
iPhone 7 4.7": 138.3 X 67.1 X 7.1 mm