Confusion about making 64 bit binaries for submission

[Jeff Brindle]

OK so I am trying to submit a new iOS app and of course it needs to be 64 bit now. So I prepared the standalone with 7.0.2 RC 1 but ran into all sorts of minimum OS compatibility issues with the app loader in Xcode. Waited and then tried again with 7.0.2 RC 2 but it now doesn't seem to generate a 64 bit binary - at least that is what app loader says. 

Any ideas? Is it me?

Cheers, Jeff