Its a Skaven campaign, and he says he'll be able to get to the late game.
3 hours a day, every day. For details on how to watch click the link, it is some specific timeslots and re-uploading later.
Edit: Also CA posted this on Twitter
Because Warrior of Sparta, Alex the Rambler, and Heir of Carthage all posted funny memes hinting they haven't got a review code yet, it may just be Total Biscuit for now.