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>> The PostScript and PDF versions in the site are still for version 3.2.
>Are these on their way too? (I mean, the 4.0 versions...?)

Yes, but only when 4.0 final comes out.

>What *are* the new semantics for forwarding return values of functions?

The manual says:

   In nested function calls like f(g(x)) all return values from g are
   passed as arguments to f. This only happens when g is the last or the
   only argument to f.

See also an example in section 4.5.9.