I am getting this email after upload my binary with Xcode Version 6.0.1 (6A317)
Your binary is not optimized for iPhone 5 - - New iPhone apps and app
In my case, I was updating an older app. It turned out I was missing an icon file named: launchiPhone5-568h@2x.png with dimensions 320x568. I found this by looking through the warnings. I created the file, added it to my project with the other icon files and it worked fine.
Hope that helps someone :-)