In reviewing the Heller v DC ruling I came across this portion:

Quote Originally Posted by SCOTUS in Heller v DC
3. The handgun ban and the trigger-lock requirement (as applied toself-defense) violate the Second Amendment. The District’s total ban on handgun possession in the home amounts to a prohibition on an entire class of “arms” that Americans overwhelmingly choose for the lawful purpose of self-defense. Under any of the standards of scrutiny the Court has applied to enumerated constitutional rights, this prohibition—in the place where the importance of the lawful defense of self, family, and property is most acute—would fail constitutional muster.
Now, I'm no attorney, but I'm thinking this portion of the ruling might give some "ammo" in a future AWB fight. The court plainly stated that a ban on an "entire class" of guns commonly used for defense would clearly be unconstitutional. Well, I think it's no secret that with several million AR-15 style rifles in the hands of common citizens that many of those guns are used for defense of self and/or property. I don't think it would be difficult to prove this and thus fight any future AWB on a state or federal level.