I do believe that KOTOR original combat definitely won't sell, not because it's bad or anything but I don't think the mainstream will like it. On the other hand, since Aspyer has a long history of porting games than actually making them it might be safer for them to just stick to the original gameplay.
It's going to be tough for them.
Aspyr have hired new people for this project (including gameplay designers). It's entire new (and certainly much bigger) team.