Most of the screens that have been released now were computer models of what they think they'll be making for the LOTR sets. That might explain the video gamish look of it all, but a LEGO LOTR game is rather realistic if you ask me.
I do agree with Canterbury that some of the sets look a bit too small. I especially have the Helm's deep set in mind.
This is the official version (for as far as we know)
And this is fanmade stuff
I would know which one to choose :P