iPhone 6 with 4.9 inch display shown up in new concept

The iPhone 6 concept shown in the video below has a 4.9-inch screen, and unlike other similar concepts, it has a Lock button implemented on the side edge.

The concept was designed by Mustafa Dağdelen, the same designer who created this concept design with a 4.5 inch display.

What do you think about this new concept?