I just returned from WDW. I took my son on the Carousel of Progress...this was my 7th time at WDW and at least my 7th time to see the show. Possibly more because it's a good place to get out of the heat when you're there during the summer.
There has been an update to the ride. I'm not sure when this changed, but the main thing that I noticed is that on the last stage, the televisions are all modern HD flatscreens. I'm pretty sure that on my previous trip in 2006, they didn't have those as they weren't yet commonplace at the time.