Xcode 6 GM now includes simulators for iPhone 6 and 6 Plus, and by default they run apps in a scaled mode.
To enable the new screen size I tried adding Default-667h@2x.png
which seems to do a part of the trick since the app now fails to run at all, with the error "Unable to run app in Simulator – An error was encountered while running (Domain = LaunchServicesError, Code = 0)".
Has anyone figured out how to get an app actually run in the 6/6+ resolution?
If you are using asset catalogs, go to the LaunchImages asset catalog and add the new launch images for the two new iPhones. You may need to right-click and choose "Add New Launch Image" to see a place to add the new images.
The iPhone 6 (Retina HD 4.7) requires a portrait launch image of 750 x 1334.
The iPhone 6 Plus (Retina HD 5.5) requires both portrait and landscape images sized as 1242 x 2208 and 2208 x 1242 respectively.
Do the following (see in photo)
right-click and choose "Add New Launch Image"