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The reoganization in i12510.test.diff will make back-porting to 2.7 slightly more difficult since old and new style classes exist. I do agree with your reasoning for re-factoring the code. (Also, as an extremely minor point, running reindent.py adjusts "pos = 70".)
I applied the patch and it works under 11.04 Ubuntu. All the tests pass and the behavior of the CallTip gives reasonable results when used interactively.
I did manage to find a corner-case where a CallTip should arise:
 >>> class A:
 def __init__(self, a=None):
 print('init')
 def __call__(self, b=None):
 print('call')
		
 >>> c = A(
Gives "(a=None)" as the call-tip. However, once the object is created, giving the __call__ argument doesn't work, i.e. 
 >>> c(
doesn't give a call-tip. This behavior is also the same without the patch.
I'll keep playing with the patch to see what else needs improving with CallTips. We might as well fix it completely.