I really like the fact that we have basically covered every subculture on both the shadow side (with the exception of site control and wargs) and the fellowship side (with the exception of Ents), which means booster pulls in general should at least have a deck they could call home.
Since it looks like we haven't decided on the last deck yet I have a couple suggestions that hadn't been mentioned.
Is there any interest in a good old pipeweed deck? I know there already is one in Revised Movie, so I understand if this doesn't take off. But put it in Serie 3 and you've already had the opportunity to get Gimli,
Gandalf The Grey Pilgrim, Aragorn, and several Hobbits to make use of pipes, and some players may find it a good good pairing with some of the swarm-y shadows to allow larger deck sizes.
You could also consider making a deck centered around Aragorn signets (maybe that is what the
Hard Choice deck is?) or Theoden signets. And finally Elven telepathy.
For shadow, I don't think it would be real fun to have a
Nazgul blade-tip/black breath deck in the mix, plus there already is one in Revised Movie. Perhaps a standard uruk-hai deck? We do already have Moria swarm on the list as a potential candidate, it would probably pair well with pipeweed.