Just received a 9641 kit to play with - not knowing much about the current FLL mat and models, it's a little difficult to guess how this kit might be integrated into an NXT robot. You can see in one of the photos here a nice use of pistons: raising a platform up.
I'll be curious to see if any teams use this kit - let me know if your team is planning on using it with one or more missions - you don't have to be specific if you don't want to, but if you're willing to share a photo or two of past FLL robots that used pneumatics, send it to me and I'll share with our readers.