Vis system is gonna be some hybrid of TC3 and TC4. Wands will charge directly from the aura like they did in TC3, so there won't be much point in having conversion wands in FM anymore.
I don't know any other details, but I know it won't be the TC4 I balanced my mod around. Nothing wrong with that. I just think trying to update FM to it would be shoving a square peg in a round hole.
Plus, I just don't want to work with 1.8.
Edit: Azanor did just happen to mention that he's removing the API hook to add new aspects while I was in the TC channel too, so that's another part of FM that wouldn't be relevant to the new TC.