I'd genuinely be shocked if there wasn't a sequel. I got this for Christmas purely based on the positive reaction on here, and I wasn't disappointed. Discussed this with a friend of mine who adores the batman series and he said this has a very similar feel to Arkhum Asylum in that they're just getting used to the LOTR setting, combat etc. The next one should be outstanding.
I feel for the next one they need to add more RPG elements for the game, in terms of finding materials etc. Nothing over the top and too time consuming, but just to add a different element to the game. Obviously need to expand of the map considerably, adding more areas of Middle-Earth. Combat mechanics and nemesis system are superb.