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I suspect there will be a definitive book at some point. It does seem like they are practicing what they preach and are describing the setting through a narative at the moment. I thought that the Warsrcolls released for the existing WFB stuff was to allow people to play the game in an Old World setting as we know those factions don't exist in AoS. Although there's lots of paints named after them 😳
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I think they're renaming the paints as they go. Or something. I keep seeing paints rotated out (kind of a problem as one of the ones I use a lot is in the "last chance" slot in the local GW store, and I need to ask if it's seeing a replacement).
Mainly, the warscrolls were so people wouldn't be left with no army to play the new game (otherwise there'd be hardly anyone playing). But you could also just claim that a warp portal opened up and dropped a bunch of Bretonnian Knights out after scooping them up from the past.