I've just been thinking, wouldn't it be a good idea if Beth made an update that just added new NPCs to Skyrim, especially NPCs that you can recruit as followers? I think it would make the environment seem more real and less static if they added more canon NPCs made by Beth themselves.
Just think about it, going into an inn to find a merc who wasn't there before, someone who claims to be just passing through or looking for adventure and profit in Skyrim. Or what about some new Blades or Dawnguard who've just been recruited by both factions?