The chase scene could go on just fine without Lurtz (since he wasn't in the book anyway ;~D), but I don't think they will complicate matters by bringing Mordor Orcs into it. Not sure it matters to the story if there were Mordor Orcs... Sauron finds out about Saruman's treachery from Pippin in the Pilantir, not the Orcs, if that part of the story is even gonna be included. Not sure how much it matters... You think it does?
WHAT!?!? Are you sure? I'm almost positive that I got his name from the book. Now I have to check it out when I get home.
Unless some of our resident Tolkienologists can help us out before hand.
Probably it doesn't, but the dialog between the 2 Orc leaders was fun...very interesting to hear Tolkien's conception of how they would use words and how their minds would work.