I saw this on Reddit programming; some interesting parts are
As a matter of fact, my favorite programming language of all time is not Common Lisp, but the S-expression-based Dylan (later Dylan versions don't excite me). High on the list of things I would like to see is a new implementation of something very close to that language, with several things designed to bring it forward to today, notably libraries supporting POSIX, multithreaded programming, Internet protocols and data formats, and good XML support. DUIM would be nice, too.
and
Q: [How do you compare] Dylan vs. Guile (a Scheme).
Mikel: Things the old Dylan had that I would miss in Guile:
* absolutely everything is an object in the sense of its objectsystem * native code compiler * iteration protocol (and the generally well-thought-out collection classes) * comparison protocol * a single convenient form for binding single or multiple values * singletons (yes, I know it's possible to implement them using the MOP) * functional features like curry, rcurry, compose, complement, disjoin, and so on * sealing * the condition system * the module system (I prefer it to that of Guile) * grew fond of several Dylan conventions that differ from Scheme (e.g. the use of "bind" in place of "let")
On the other hand, Guile does provide some things I would misss if I had to go back to the old Dylan, notably threads and SRFI support. As I've said above, I'd also like to see a modern Dylan support POSIX and XML and Internet standard protocols and data formats.