Passing the news along from /r/linux_gaming, it appears that Medieval 2: Total War is next in line for a Linux and Mac port - https://steamdb.info/app/4700/history/

The depots were just added yesterday, and the timelines for these things are never set in stone, but a good guess might be a November release (with Steam Machine releases).

At this point, it's assumed Feral Interactive (who did the excellent Empire port) is handling the ports, but no official confirmation yet.

November is shaping up to be a very good time to be a Linux/TW gamer - Rome 2, Attila and (hopefully) M2TW releases!