This is a really interesting/exciting case for reasons that go beyond gun control too. From the Wiki link:
Wikipedia wrote:
In addition to claiming the Second Amendment should be incorporated through the selective incorporation process, McDonald is unique among post-Heller gun cases in that it is asking the court to overturn the 1873 Slaughter-House Cases. Slaughter-House determined that the 14th Amendment's Privileges or Immunities Clause did not apply the Bill of Rights to the actions of states (and by extension, local governments). If overturned, the Selective Incorporation process would be moot and unnecessary, as the entire Bill of Rights, including the 2nd Amendment, would be applied against the states.
In attempting to overturn Slaughter-House, this case has garnered the attention and support of liberal legal scholars interested in its potential application in areas outside of firearms law. Their interest is that if Slaughter-House is overturned, it is possible that constitutional guarantees such as the right to a jury in civil cases, right to a grand jury in felony cases, and other parts of the Bill of Rights, as well as future court rulings and existing federal precedent, not universally guaranteed in actions by the states, would be applied against the states automatically.
Even further, if the P&I Clause is significantly rehabilitated, the implications for all kinds of regulations could be huge. Basically, a libertarian's wet dream:
'libertarian activists behind McDonald openly explain that the reason they are pushing the Court to overrule Slaughter-House has nothing to do with guns. Instead, they want to advance a libertarian economic agenda, where federal judges could sit in judgment of state and local laws involving labor, employment, business regulations and other economic issues. Although the Constitution is silent on these matters, these activists want the courts to start declaring constitutional rights against such things, and using the power of the federal judiciary to strike down laws of this sort that the judges don’t like.'
I'd be very surprised if any modern Court, let alone this one, would go that far, but it's definitely going to be fun to watch!