The problem with these, is that they aren't really on the WH2 map, they are on the WH1 map (as much as I'd love to see Kislev and their bear mounts and Lore of Ice). Amazons and Araby could work, but they'd need to really flesh these armies out as they did with Norsca. Ogres and Chaos Dwarves could be done, but they aren't on the WH2 map either (and really make more sense as DLC with WH3).