I'm interested as heck but I don't have a solid plan for a faction yet. One thought was a 'third wheel' to the Yore/Rhune Empires; maybe a republic that grew out of a collective dislike of the monarchies, or a lone province that managed to fight an empire off for its independence, a la the Swiss.
But then I thought about Chaos northmen and horse tribes and I'm bouncing between a host of ideas.
Honestly having some notChaos Vikings would be nice for the balance of the RP as there is really nothing up there right now but a few dwarves. You'd also have plenty of more targets to go after since I know a few people have encounters with the northmen in their NSs (I think).