Came across a Droid Turbo Prototype which has a big difference than the release version. The power button is the Motorola Logo on the back. It's interesting how they decided to drop that design to go with the button on the side, and also gets you thinking how many variations of prototypes they go through with different designs. Would be cool if someone would know how to incorporate this feature to be able to be applied to a release version but would be hard considering the fact the inner parts (moto power button and flex) are not mass produced or available. In this picture bellow, you can see I circled in red the top connector which is for the flex cable that leads to the motorola logo power button on back (on the release version this connector is not soldered onto the board, and the bottom two connectors I dont know what they are for, but they are covered by a metal shield on the release version board. You can look at the YouTube video bellow to see the Release version disassembled to compare to the prototype.