I am ready to place my final bet... I am betting this is going to be a Stainless 357 Mag Flattop Blackhawk in the new midsided frame. I don't see enough demand for them to make the 44 or ever 41 a standard offering but the flattop in the slightly smaller frame does offer something unique and is safe for all loads.
Perhaps later we will see the 44 Specials and I pray we will also see a 45 Colt or at least a 41 Mag version as a distributor exclusive but I will bet the initial offering will be 357 Mag. Hell, I might just need to buy one myself if they offer it in a 5.5-inch barrel as a lighter mid-sized stainless Blackhawk would make a great plinker as well as packing gun.
The 454 Hunter is a long shot, the 327 is too small of a market, the 44 Specials or 32-20 is just niche market, but a 357 stainless midsize blackhawk.... that is just full of win with the potential for lots of new variations as distributor excusives or future line extensions!
So, my final bet is in, see you all on Jan 4th!