I don't know if this has been noted before. If so, my apologies, I haven't been able to frequent the forum for a few weeks now. Just thought I'd post this one sentence from CA's press release regarding the "Kingdoms" Expansion, to hit the shelves sometime in autumn:

"Each of the campaigns is also fully compatible with a brand new Hotseat multiplayer mode, making this an essential addition to any Total War fans’ collection."

If this is true, then some people's dreams have finally come true! I've wanted this so much for such a long time, it's great to finally see an MP campaign integrated!