I believe the president felt he had to say SOMETHING, lest he lose all credibility with his base. I can imagine tremendous pressure on him if he remained silent on the matter.
But I predict nothing will happen between now and November.
Remember that Romney signed the AWB in Massachusetts and has said he would sign an AWB as president. I have yet to see him recant.
See: "Mitt Romney's Draconian Gun Control (December 2007)" on YouTube.
I am more concerned with what the Romney might do as president, than what Mr Obama might do before November.