Yes, the only ISO 640 color film made by 3M/Ferrania was the 640T tungsten slide film.
I'm eager to have them manufacture it again. They do have the formulas and the rights to use the formula, and the factory, so it's not impossible. On the other hand, it is not as easy as "just follow the recipe"; they will have to re-engineer it for the available chemicals, re-scaled process, etc.
Thanks so there is only the question of which film they should re-engineer next, by market research?