I haven't looked into it, but I doubt it will be much harder. You can probably expect the need of a higher spike damage for the last boss or something.
But, remember that even relatively new people NEED to be able clear this thing or their progress gets CUT OFF ENTIRELY. The idea of putting Ori into GO only, then gating progress behind Ori, and then making GO much harder... is only a good idea if you want to KILL YOUR GAME. I'm not saying that DMM is absolutely smart enough to not go into a trap like that, but hey, we'll see eh?