When I submit build to AppStore I see errors:
ERROR ITMS-4088: \"No software found with apple_id: *\" at SofwareAssets
ERROR ITMS-4238: \"Redundant
For the "ERROR ITMS-4238: Redundant Binary Upload." issue...
I simply used the Apple Application Loader (along with ensuring the Version and Build numbers being unique) and it worked perfectly.
It looks like Xcode6 GM have some bugs interacting with iTunes Connect.