https://github.com/cisco/ChezScheme
Edit: Hmmm. Also Matthew Flatt from Racket.
That discussion links to a Google Groups page where Matthew Flatt discusses the background, status and plan going forward.
[0] https://news.ycombinator.com/item?id=13656397
First and foremost it will mean that much more of racket will be written in racket, and some in r6rs scheme.
If they can capitalize on chez's preformance that would be even better. It is really a state of the art compiler for GCd dynamic languages.
https://github.com/cisco/ChezScheme