Judging by the tech seen in Boruto, if they are from his suggestion then, cyborgs...So probably a cyber punk city with cyborg wielding laser swords as the characters with some energy that is similar but no quite chakra.
Edit: Well I was right; also include Japanese cultural references, and clothing apparently.
So Battle Angel Alita-esque; probably not as post apocalyptic. I guess it depends on what his plot is, then, and if he decides to get weird with it. The Japanese variant has tended to get a little loony as far back as Tetsuo: The Iron Man, which is about as David Lynchian as anything I've ever seen out of Japan. I love the hell out of cyberpunk, so it might get my attention if true, but even then, I wonder if he has the chops to actually pen anything interesting in the setting, much less go anywhere with it.
I guess it would show if he could do anything beyond a straight action shönen, at any rate.