Full screen of iPhone 6 not used

I used the app this morning on an iPhone 6 with iOS 8.1 (12B411) and intervals 3.6. The new 3.6 does not use the full iPhone 6 display. Instead the pixels that correspond to an iPhone 5 are displayed with white space on the right and bottom. It seems that the app no longer scales the display, however, the display is for the 5. 3.2 on the iPhone 6 was a scaled version that used the full display and was preferable. The best would be to use the native resolution of the iPhone 6 fully.

I do not think this is a significant bug, I am reporting in case you have not tested on an iPhone 6 and are not aware of how it looks.