Chicago does have much and I do miss it...its my hometown, the place I was born in, where I grew up, and began raising my own family...Chicago has something for everyone...
I went back and reread your post with the link to the Field Museum website, and I noticed that this new exhibit is a permanent exhibit, and I am glad to see this...I was not certain if it was a permanent exhibit or a temporary one...
I hope to get back to Chicago in the next few years, and revisit all the wonderful museums of Chicago, as they were always my favorite places to go...tho most of my friends and my own children preferred the Museum of Science and Industry(well, one can understand this, the Museum of Science and Industry, has more bells and whistles going for it, than the Field Museum), the Field Museum was always my favorite place to visit...I am anxious for the day when I can return and visit the Field Museum again, see Sue, see the new Evolving Planet exhibit, and revisit many of my other favorite exhibits from that wonderful museum...
If you're bringing any kids with you, be sure and hit the Shedd Aquarium. It has probably changed pretty significantly since you last saw it.