Well, I'm taking as an axiom that Skaven, one of the most popular races, will be in at some point. If it's not the 2nd it will be the 3rd, but it will most definitely not be DLC for the current game. Hence why I said "an expandalone" and not "the next game"
Looks like the skjaldborg have arrived A new race pack for the first game. Coming on 10th August. It will be avaible for free for whoever preorders Total War: Warhammer 2.