Multiple American fabs--older nodes, but there's still plenty of stuff to be made on 14nm, let alone 90nm. Patents. A sales-pipeline team used to working with external partners instead of doing everything in-house.
Not everything is made in the newest processes. Upgrading existing fabs to newer processes has benefits over building new ones. GF might have useful experience, e.g. with being a contract fab for others, if Intel wants to go that route.
I don't think this has anything to do with next gen process. It points toward Intel needing help starting their foundry service in sales and external tooling.
I don't think it's related to making up the difference or not.
GF won't have much if anything that helps them in that regard, so I think it mostly means that Intel thinks they can use more capacity of their own, even for not top-end process.
How far behind is Intel really?