Purpose: develop a list of needs and wishes for someone developing stand alone or suites of applications. See also Extension Developer's Wishlist for Tcl and Application User's Wishlist for Tcl. Tk can also be covered here (we can spin it off to a new page if necessary).
What constitutes urgent or required? Good question. What is critical for one person might be fluff or nonsense to someone else. The best I can do is give this kind of guideline. I would personally consider a feature urgent and needed in Tcl if it required the core to be modified, or extensive new code to be developed (as opposed to a wrapping for an existing library), to support some feature that might be useful to more than one customer.
Tcl 9.0 Wishlist would, in my mind, be a subset of the total wishlist.