I'd say one, but because it went into the fans, there's a good chance he'll get two.
I don't think Rondo punched Humphries; it was more of a 'double-stiff-wristed-open-handed' slap to the face.
I think Gerald Wallace needs to be suspended longer, though. He just jumped right into it and attacked KG, who had done nothing at that point. KG didn't even fight back, he was just trying to grab Rondo. Same for Pierce, but Reggie Evans was grabbing him. I don't think Evans should get in trouble, but Wallace pulled an absolute bush league move on KG. Disgusting