I gotta agree with 3333 on this.
For one thing, the president will not be able to reverse the supreme court on the 2nd so if he's planning on rounding up guns with an executive order, lol... The supreme court is one avenue for overturning executive order. So if it's already against the court's ruling, then uh, nope he can't do that.
But anyway Obama promised that he would not use signing statements as an end run around congress. The video is on youtube. Signing statements are what the president changes with legislation before signing into law. He's already broke his promise on that.
Now with executive order, it sounds like he's looking to go around congress on an issue that congress should absolutely deal with. That's breaking the spirit of the promise he made with signing statements even worse.
Congress can cancel his executive orders but they'll be pussies and won't.