These are all the Fuji GFX prototypes. Damn you Fuji for not making the GFX version of the X-T3 :)
Dpreview published the images of three different GFX prototypes:
1) The modular concept named “Omega”:
2) The X-T3 styled concept named “Gamma”:
3) Another ssimplier XT design alike camera:
4) And the “SP-X” camera without EVF:
My personal note: Damn you Fuji for not making the X-T3 styled GFX camera. This is my dream camera!