Quoth I: [... PEP 317 rejected ...]
I'll certainly add a section on the reasons, with discussion of the new-style exceptions question, and a summary of other feedback.
These additions have been made: http://www.python.org/peps/pep-0317.html#rejection (et seq.) If anyone feels that the additions omit or inadequately treat important points raised in the discussion, please let me know. (By email, please; no reason to trouble py-dev with such.)