Hello everyone... long time reader, first time poster. I work at Disney's California Adventure and got to see the Muppet Mobile Labs first hand. I think anyone who is able, should come down and see it in person. Not only is the technology impressive... Dave Goelz is performing Bunsen himself during this limited test run. You WILL be sorry you missed it. I had been hired by Disney and Imagineering to do the test until Dave, himself decided to be a part of the project.
I got to hang out with Dave for about a half an hour and the guy is very gracious. I had some puppet rods in my bag that I had made for a friend at the park. I took them out in order to dig out my Muppet book for Dave to sign, when he asked to see them. He was genuinely impressed with the design and execution. They are designed after the rods I had used in Avenue Q so while I didn't come up with the idea, I was sure happy to take the compliment. He's not a talkative man by any means, but he'll basically tell you anything you want to know... however, thinking of the right questions to ask when in the moment is not as easy as it should be.
I saw day 4 of the test run and Dave has started to work out good bits with the crowd while still coming out with fun "off the cuff" comments. As Bunsen surveyed a small group of people who had basically lined up in front of him just as the Muppet Labs came out from backstage, Dave let out "My, look at you all. You look like the offensive line for the Rams." I'm not going to spoil the illusion and tell you all HOW it works... but Dave is definitely performing the character. Do not miss it.