Corran
Well-known
Let's hope it's Panatomc-x, Plus-x and original Tri-x 400 from the 60's.
I doubt any of those, and don't see any reason for them. There's plenty of slow b&w film on the market, and I doubt Panatomic-X or Plus-X has significant reasons to exist in addition to T-Max 100, not to mention other non-Kodak films like FP4+. As for Tri-X 400, at this point the current emulsion has been on the market for decades. Changing it would piss off everyone who currently has things dialed in - unless you are suggesting an additional SKU, which would be insane, as it just competes with itself.
The only reasonable product to introduce (or re-introduce) is TMZ as has been hinted at, if we are talking about b&w. Someone mentioned a fast color neg - Portra 800 still exists doesn't it?
I just hope that if it is TMZ, the extend the production to 120, or man how about 4x5, that would be cool.