For that matter, Project Soul is not really pushing the limits of their current engines or the heardware they are producing for. The ability to pull in assets as described in the demo could be a major game changer for budget productions, so i could see it having an impact on the next Soulcalibur in that respect, but right now they don't even have a particularly high quality of basic design for most stages in SCVI, and increases in potential visual fidelity will count for very little if the designs aren't approached to leverage those new advantages. On the other hand, one thing that I think might produce obvious improvements right off the bat is the texture rendering, physics and contextual movement on the models and their garments. But as you say, it's 2021 for the engine--and I would add who knows when for SCVII; Project Soul have pretty much never released a game until at least a few years into a new generation of hardware.