The US Supreme Court has granted cert, vacated, and remanded 4 important Second Amendment cases to 3 Circuit Courts of appeals. They involve bans on magazines, "assault weapons", and carry permits.
The Office of the California Attorney General has put out a Legal Alert which seems to be suggesting ways to violate the Second Amendment guarantee of the public carry of arms.
The opinion by Justice Thomas is relatively simple. The Constitution must be interpreted as what it meant to the people who ratified it in 1791.. Shall Not Be Infringed.