It would be nice to see Plus-X back.

E6 as well.

Ironically, if they are able to re-establish a reasonably effective distribution chain, and have some success with it, it may prompt the (re)-development of some older, discontinued products.

Especially ones that don't require re-introduction of chemistry.

I wonder if we might see the return of Kodak instant materials!

I would certainly expect that improved distribution could prompt the re-introduction of certain sizes in sheet film, and maybe even sheets of colour paper.