One of the really cool things about Proof Copies is they remember the rendering intent you used to based the edits once in the Print module.
So I've not got this clear thank to Eric. The only feature here is the RI is remembered, you still have to select the right profile in Print. I was hoping Print took on all the attributes 'assigned' in the Proof Copy, it does not. It only assigns the rendering intent once everything else is setup there for proper color management (eg Not having Printer Color Management etc).