I think the preorder will be Ind.
It’s (likely to be) the largest landmass in the game without a potential placeholder/ alternative race.
I think chaos dwarfs and ogres will be dlc races. Nagash may be a lord pack. Nippon is less likely than Ind because the island can easily be cut from the map. Dogs of war won’t come.
My other thought was that a lot of the upset mentioned on the forum comes from what is perceived as unbalanced campaigns (I actually like the randomness and different strengths of the factions, it makes it interesting), but they could just add an option on the main menu. Simply have it as a slider making order or destruction races more difficult. If you start a campaign as an order race, set the slider favoring destruction so it makes for a challenging campaign and vice versa.