Here's the transcript of the court session-

http://www.supremecourtus.gov/oral_arguments/argument_transcripts/07-290.pdf

I think the biggest part of the decision to be made is whether the 2nd amendment will be "incorporated" or not. Incorporation is the concept that the rights listed in the BOR cannot be reduced by the States.

For instance, if the State of New Jersey only allowed persons who were born in NJ to vote in any election within the State they might be within their powers. Incorporation says NJ can't do that because voting is protected at the Federal level.

It's conceivable that the Supremes could rule that 2A only applies to the Federal government and therefore a State (County/City/HOA) level can ban anything they want to. This would be an example of not "incorporating" the 2A as a right.

It's possible that since the case is not over a State's regulations that the incorporation question will not even be addressed and we'll have the mish-mash in the rest of the country unchanged.

In that event it could be another 70 or 100 years before another clear 2A case could get to the Supremes.