Without my interjecting (yet), the best read I have seen so far concerning the case is put forth by The Volokh Conspiracy.
There are three posts there. See what you think at one, two and three.
Apparently, we will be waiting until around the June timeframe before we get to find out SCOTUS’ ruling on this.
I hope this works out for all of us in favor of cities and states following the Constitution and not their own poor judgments.
Oh, and Doctor Zero has a nice, appropriate, well written article on the Right to Keep and Bear Arms. I like his style and I certainly agree with him.