Yeah, although maybe Devolver and Gearbox have come to some agreement concerning Megaton Edition.
Perhaps, but the rumbles in the DN community of late have been from some things that I am going to outright put out as rumors and hearsay, but believable rumors and hearsay considering who is involved is that Gearbox is working on a reworked version of DN3D that makes broad changes to the game, in addition to modernizing and updating it (to what that exactly entails has been the topic of discussion since the first "leak") but I would put firm money on it being Shadow Warrior for now at least.
I think I know what "rumors and hearsay" you are talking about and yeah I would agree with your categorization of it as "believable rumors and hearsay". But who knows, Gearbox may have decided to base their port on Megaton Edition afterall and reached an agreement with Devolver for that purpose. For all we know 3D Realms and General Aracade may have partnered up on something completely different. 3D Realms intends to gets back into working with 3rd party developers afterall.
But that is all speculation..so I agree with you that Shadow Warrior Classic Redux is most likely at this point.