I'm not sure whether this is a bug of Apple's SDK or MMF2, but if the status bar is set to be hidden from within MMF2, it will be hidden for the Default.png screen, but will then be shown after that. In Xcode, the "Status bar is initially hidden" is set to "YES", as I assume it should be given that it's that way in MMF2.
Obviously, it could well be one of iOS 7's bugs (beta 4), or a bug of Xcode 5, but I thought I'd report it just in case it was due to MMF2.