I dont really think its odd that only 2 Ringwraith's are released at start, its just the first wave. And looking at the total wave, its pretty well mixed. Both in Fellowship characters, Scenes, and something from each of the 3 movies. (3x Fellowship o/t Ring, 2x Two Towers, 1x Return o/t King, And Orc Forge, which isnt really related to one movie i guess)
I think its pretty easy to come up with sets, which have a strong tie to the story, and include some characters, and besides that, they can make lots and lots of Battlepacks with Soldiers and Characters from each faction.
And to share my thoughts, these are some of the thing i came up with / have a strong desire to see released,
- Bridge of Khazad'Dum, Amazing part in the movie, Stairs that can break off / lean forwards to get the fellowship down, Moria Orcs chasing them, and in the end, a collapsable bridge with Gandalf and a brick-build Balrog (with maybe a light brick inside )
- Warg Attack, The people of Rohan getting ambushed by orcs on wargs (new mould ) and some Rohirrim defending them + Aragorn on Brego, who gets missing.
- Battle on Pellenor, Witch-King of Angmar on his Fell Beast, Striking at Theoden, and Eowyn and Merry killing him.
- Forbidden Pools. A part of water, with gollum and a fish, surrounding by rocks, and the outpost of Faramir and his Rangers, with captured Frodo and Sam.
Ahh, a man can dream =D