Warhammer Invasion LCG is trying to make 4 Neutral support factions into a "fully fledged factions with capitals of their own". It's looking like a one-shot deal for casual play, since the card pool for those Neutral support factions is nowhere near pervasive as the standard 6 for Invasion.

Which leads me to note the recent art works being commissioned for our House Arryn (see PoD for AGoT the boardgame in news).

I make this claim anew:
We may yet see a one-shot House Arryn deluxe expansion for casual play and maybe House Tyrell as well if we're lucky.