From what I've heard from the PLT people, they are definitely interested in bringing these experiences to Racket; hopefully experience with LightTable will provide some insight in how to do that.
By Racket here do you mean DrRacket?
DrRacket is an IDE for the Racket language. I never really understood why it stopped being DrScheme, or why Racket looks a LOT like Scheme. Then I read this http://racket-lang.org/new-name.html
Yeah, I was asking if the experience he was talking about was an editing one.