Of course at the time Slowpoke clarified this, he also said he had not taken a good look at the new Thaumcraft yet and its exclusion for the map mod pack is subject to change. Personally, I don't think it's unlikely he'll change his mind as the new research mechanic is heavy in resource management, which seems to be the theme of the FTB map. In a skyblock style map where resources are quite limited to begin with, I think it would integrate extremely well with the rest of the resource "puzzle".