[plt-scheme] optional parameters?

On 9/15/07, Robby Findler <robby at cs.uchicago.edu> wrote:
> If you want to read more of the higlights of (lib "class.ss") you
> might want to check this out before reading the docs below:
>
>   http://pre.plt-scheme.org/docs/html/guide/classes.html
>

These docs are great.  I haven't seen them before.  It looks like it
describes an upcoming version of Scheme with a lot of new useful
extensions built directly into the core.  When is this version
expected to be released?

--Mark