I agree; we don't want to require people to read the 2.6 document, and
then the 3.0 document to get a complete picture.  

Besides, the organization of the 2.x documents may not be suitable for
the 3.0 document.  The 2.x documents are organized by PEP, then a
section for miscellaneous language changes, then a section for library
changes.  For 3.0, you probably want to do all language changes in one
section, ignoring how they were broken up into PEPs, then a section on 
the library reorganization, and then maybe sections on using 2to3 
or porting C extensions.

It's certainly OK with me to copy text from the 2.6 document into the
3.0 one, if some of the text is useful.