Very interesting! Great timing for myself, as I just pulled the Chez github repo just last night— a whopping 900mb btw!
Chez became a point of interest to me after learning about it's solid performance (can even do whole program optimisation and across library boundaries).
I wonder how feasible it would be to build a Chez target for Clojure?
Most recently it has been open sourced under a GNU license by cisco, and is even on Github.
Looks like good times for Chez and Scheme!