I plan on taking my wife to see it, just the two of us, before deciding about the kids.
That's my plan as well. However, my wife is not excited about seeing it at all, and I can't wait to see it. In addition, I always take my girls out on dates over the Christmas holidays. My oldest (the 10 year old) wants to see Fellowship of the Ring, or nothing! I'm taking my 8 year old to Monsters, Inc. So, somehow I've got to drag my wife to see Fellowship of the Ring soon after the opening so I can do the date thing with my 10 year old.
Then, if we do decide it's not appropriate for her, she'll be crushed.