I just updated my iPhone 4S software to iOS 7 Beta 2 while I was in the middle of putting the final touches on a new app (Phonegap).. not a good idea!
After it was d
njtman had a correct answer. I don't have the rep to comment so I am adding more details.
You need a iOS 7 SDK to use the standard architectures (armv7,armv7s).
My project was defaulting to (armv7), not including armv7s.
To fix this, Open CordovaLib.xcodeproj, Under Build Settings (one of the menus in the top row, centered alignment) Under architectures, Architectures, Debug and Release, ADD iOS 7.0 using Standard architectures.