There's a nice picture of Huey Lewis reading to children on the Playbill.com website. The surrounding article describes him as "effervescent." I don't usually see articles use that word in describing him, but it seems apt nonetheless.
There's also a site with a flash video clip of three songs from his performance in the Chicago (I think from his first night). I liked it, especially the puppetry number. I particularly liked the look he gave to his Brooke Shields "puppet" when she gave the wrong answer to the "Are you sorry he's dead?" question...
It's interesting watching him in the video and seeing which mannerisms and gestures are organic to him. There's obviously quite a bit different about this performance compared to his normal act - not the least of which is the musical motif of his songs. I do have to admit that I miss the soulfulness his voice normally has, but still he has a nice voice that's obviously capable of singing other styles. And a lot from this performance is the same, like his stage presence and the way he moves about on it. Though much more constrained by the choreography than he usually ever is, his body language - the bits of physicality he's brought to the role - are very much his and much like I've seen him do before.
I had one other thought, watching the video, which is that it feels like I'm looking at an actor backwards. Normally, people see an actor and imagine the person behind it as colored by the role. Here, I already know the person behind the role, and now I'm looking at the acting as tinted by my familiarity with him. I don't think this is bad, per se. (Arguably it might even be good, because I can appreciate the actual effort put into the performance by contrasting it to how I normally know him to be.) But it does feel unusual to have this perspective, so I thought I'd state the observation.