Comparing the developing times it look like a derivate of PAN F. Rollei doesn't produce film. If they would, and the would create a new one: Would that film be only available in 120?
I recall a questionnaire here on Apug about the possibility of Delta 25 by Simon. I read that Harman worked with Efke and Maco to produce the RPX 100 and 400 range. Which was said to be similar to Kentmere.
It'd be cool to have a epitaxial 25 speed film. Either way I want to get my hands on some.