Does the iPhone 6 home screen / SpringBoard rotate?

No, the iPhone 6 home screen does not rotate in landscape mode. This feature is limited to the iPhone 6 Plus, which has a larger display.

The iPhone 6 does not support special app layouts that are designed for the iPhone 6 Plus.

On the iPhone 6 Plus, the SpringBoard enters landscape mode when the device is turned on its side. This results in app icons rotating and the iOS dock moving to the right side of the display.