Good Question
First off, does anyone have an idea whether the McDonald decision moots the city ordinances in deference to state law, or simply mooted it based on its onerous provisions? Absent a valid local ordinance, does state law prevail? Probably.
If Chicago were practical about it they would adopt the state standard, or something similar to the local municipalities. However, (Glenn, I'm going to risk it) Mayor Daley isn't likely to voluntarily implement or allow the implementation of anything that allows citizens concealed carry, as his position vis firearms is well known.
To my knowledge, Chicago hasn't announced what it will do so the question is timely, but premature at the same time. Unless of course citizens can squeeze through the gap by compliance with state law before Chicago has time to adopt some other, ostensibly less restrictive, local law.