Moving to iOS6 I get this linker error with almost all external packages?

Yes, they will have to release binaries which are compiled for armv7s architecture to support the new iPhone 5 A6 processor. In the meantime, you can temporarily compile against only armv7 to continue development on iOS 6 on your current device until those other libraries are updated.

EDIT: Problem with Restkit solved, check out the latest commit from github: git://github.com/RestKit/RestKit.git.

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