Just got my 6+ and realized that there is about 1/2 of gap between the screen and the silver housing. The gap looks like the screen is not sealed properly, it's located right above your earphone insert. Take a look...
I might go exchange it because looks like water may get inside. Let me know if any of you also have the gap.
Have you tried pressing this section of the screen back into the housing? On the 5/5s, the tabs on the assembly are at the earpiece side, and the bottom portion snaps in place. Sent from my iPhone.