Btw, lore wise TOW happens in final times of "Age of three Emperors" but how many independent factions there were at this stage? Marienburg, Reikland, Talacbeland & Middenland seem obvious but based on map on GW page it would seem that Nuln is also independent at this stage. What about Ostermark?
The rulebook itself states there are 4 main claimaints: Westerland, Osterlund, Reikland, and Grand Duchy of Talabec (p45). However, since Middenheim is long since diminished, the other subordinate provinces Ostland, Ostermark, Hochland and Middenland are effectively independent, and the Wolf Emperor really rules just the city-state itself. Similarily, Talabec is disparate -- both Talabheim and Nuln are mostly independent city-states, and the other provinces are also more or less self-governed.
This matches with the old roleplay lore more or less. Middenland declared independence from Middenheim in 1550 IC while the Wolf Emperor made a failed siege upon Talabheim. This is when the Middenland count received a Runefang (stolen from the Middenheim vault, no less) and made an elector by the elected Emperor of Nuln (
Warhammer Chronicles 2004 page 4). Then there's the story about the Carroburg Greatswords, who defended Middenland's capitol from an Middenheim army (
Chronicles p4.). This originated from the original Enemy Within RP book (Warhammer City: Middenheim, IIRC) and probably used to justify why both Middenheim and Middenland were elector provinces in the campaign.
2nd edition roleplay had Talabheim rebelling against Talabecland in 1750 IC, which would not be reunited until Magnus (Sigmar's Heirs p17 & Terror in Talabheim p5.); interestingly enough, this was not the justification for why Talabheim and talabecland were also separate electoral provinces in EW -- rather, in RP 1E, Apocrypha 2, page 15, Talabecland was made a separate electoral province after Magnus' death.
However, no explanation on why Sudenland is marked as a separate faction on the map so far. While it is true Sudenland is a separate electoral province in EW, if the writers are not planning to give it some character, why bother making it seem like a major player at all?