Just from talking around my friends - which in my circle of friends means that most of them have science and engineering backgrounds, I suspect the Saturn's going to be pretty big - non-Lego fans are seriously considering picking it up. It's a good price, a decent size, and it's showing appeal outside the AFOL family.
If Lego can get the word out there - and I suspect Lego fans are assisting in that (I certainly am!) - they should do well off it.
Edit: Basically, the same point as Ryuuroden, although I didn't consider the possibility of stock issues as a result.