Well to answer the first question I would say they won't be making any more scenery or terrain for
lotr really. I just say this because I am pretty sure that
gw has or is taking out the warhammer fantasy terrain. *don't quote me on that tho
Plus the way games workshop prices are I think it would be extremely overpriced sadly.
It would be really cool tho if they did tho.
On a side note I did see on YouTube this guy who was using some of the 3D puzzles of the fountain court and orthnac tower (however you spell it).
They scaled pretty good and are decently priced and look good (no paint required)
So that might be an option if you want some new lord of the tings scenery