I was hoping that too but now people are starting to say he is just a custom fill-in like EV9D9 or the Rancor.
There is also a “prisoner Han Solo” figure pictured in a jail cell that looks brand new too. Looks like Bespin Han but with white sleeves. Hmmm
I've heard similar things, also. But Bib Fortuna seems a little too prominently featured, the same as the Rancor. And too detailed, too.
In the case of the droids like EV-9D9 and 8D8? Those look like upscaled versions of their POTF2 3.75" counterparts. Hasbro has the capability to scan the old figures and digitally upscale them to render a larger version with a 3D printer. And I think they may have done that in this case.
But based on some rumors? I think that Rancor is waiting for a new Jedi Luke in the Tatooine costume to be revealed and placed in that diorama.