Funnily enough, the PLT group is working on a new language for education called Pyret http://www.pyret.org/. It's not very similar to Scheme, it is very similar to Python.
It would be more accurate to say that that Shriram Krishnamurthi and his group at Brown, which are one part of the large PLT "collective", are working on Pyret. The rest of us are still working on Racket.
