PLT Scheme 4.0 to introduce major new changes to Scheme

Unfortunate title. PLT Scheme 4.0 introduces major new changes to <i>PLT</i> Scheme.

"Improvements to the PLT Scheme language include better syntax for modules, better support for optional and keyword function arguments, more expressive syntax for structure types, streamlined hash-table operations, new syntax for list comprehensions and iterations, a more complete and consistent set of list and string operations, and reduced dependence on mutable pairs."<p>In the abstract, sounds like a Scheme that can compete with Python and Ruby.

I've been using the pre-release versions for a while now and there are some nice improvements. Some of the syntactic sugar is really nice to use, like the new module and require forms, and the generalized lambda forms (combined lambda, opt-lambda, define/kw,...).

Does anyone else think that PLT Scheme dialect is moving closer to Common Lisp?

I just did a little wandering around the available documentation on PLT-Scheme and noticed that large pieces are untouched since 2004. Other large pieces seem to be missing. Seems like an un-propitious start for 4.0! Or perhaps this is what they meant by new work for 4.0 docs...