Yes that could be. In fact that was also my first guess but he said “3D environment combined with 2D sprites ”- that seems more like No.6. I hope he will change it if he meant No.5.

Btw- I don't know if Superku decided to quit the project? His name is not in team list & I remember reading somewhere that he is the coordinator of the programming team but if you go to the Untitled platformer - team members(i just been there) you'll see that programmers have to choose programming team leader. Very strange.