After upgrading to 6.3 and building an archive for my iOS app, the archive appears under "Other Items" and "Submit to App Store" is grayed out.
My archives built prior to upgrading are listed correctly under the name of the app.
I noticed that it works correctly for the Mac version of my app.
I tried changing the iOS version's target name and scheme name to all match the name under iOS Apps in the Organizer but that didn't help (if only things were that simple!).