Bill, we had a 2001 Honda Odyssey for 10 years, and traded it in for a new 2011 Odyssey Touring. BIG DIFFERENCE between the two!! Ours has active noise cancellation, and the way it was explained to us is that there is a microphone in the cabin, on the ceiling that picks up certain frequencies, then transfers the opposite frequency to the speakers, effectively canceling those noises. Ours also has a noise suppressing windshield that either has an extra layer of lamination, or is just thicker than non-touring.
Our 2001, while a good, dependable van, was a tin can. This one is a vault.
If Honda would put the noise canceling system in their smaller vehicles, I think it would be a smart thing to offer, and a lot of people would buy. But I'm sure Honda probably thought of that...
Apparently Honda agreed with your suggestion. The 2012 Honda Pilot Touring my wife just bought also has the active noise cancellation system and a new thicker windshield that suppresses road noise from that source. The car is noticeably quieter and more pleasant to drive. Product literature I have read claims the 2012 Pilot is much quieter than the 2011 Pilot.