Back in March I blogged about signature objects and __decorates__. Well, discussion on python-3000 has led to a proposal for a way to have required keyword arguments. That led to Guido suggesting that a signature object come into existence. Well, I already had a rough draft PEP on the topic written from back in June, so I just sent that to python-3000 as-is to be discussed (list is moving pretty fast plus I am on vacation for my father's birthday so I can't really put that much time into it).
So it looks like there is a decent chance we will have an object representation of the parameter list of an object!