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If you are looking at starting with a hybrid approach and move towards a more native UI, you might like Calatrava - http://calatrava.github.com/

Disclaimer - Two colleagues of mine wrote Calatrava.

I'm not sure why you'd want to use PhoneGap if you're also using RubyMotion, but it seems possible.

If you are going to eventually use RubyMotion, why not just start with that?

I have been using it for about a week based on a recommendation from another HN'er and I have been extremely pleased. It is all new development, though. I am not especially good at Cocoa or Ruby, but have found it a very enjoyable experience.

Web Views and RubyMotion