The current Version of Devnull 1.63 doesn't take into account the new mounts from the latest patch. So no need to worry about the AI right now.
Rollo is however making a new Version that will take advantage of the new patch. Its just taking him a little while cause he has to edit all those pesky AI files.
If you want to play a game using the Devnull mod, go ahead however, as 1.63 is compatible enough to play .
Cheers