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The patch looks reasonable. I built on it with the following changes:
 1. Added some extra test cases to cover Unicode format strings, 
 since the code was changed to handle these as well.
 2. Changed test_builtin.py by 
 s/m[0].message.message/str(w[0].message)/, since 
 BaseException.message was deprecated in 2.6.
I also have the following general comments:
 1. PEP 3101 explicitly defines the string conversion for 
 object.__format__. What is the rationale behind this? Should
 we find out before making this change?
 2. I don't think the comments in 'abstract.c' and 'typeobject.c'
 explaining that the warning will eventually become an error are
 needed. I think it would be better to open separate issues for
 these migration steps as they can be tracked easier and will be 
 more visible.
 3. test_unicode, test_str have cases that trigger the added 
 warning. Should they be altered now or when (if) this becomes 
 an error?