since I watched the match knowing he was going to hurt himself, i noticed that his knee was bothering him the second he stepped in the ring. He reached down and rubbed his knee the first time he planted. This makes me think he was worried about his knee, overcompinsated, and tore his quad.
with the NWO only having 2 members that will be able to wrestle, I would say that HHH may actually join them. It was looking like it was gonna be HHH turning them gown at vengance, in order to fued with them, but now I think that the WWE has the NWO too involved in angles to trash the stable, thus they will need more bodies. Also Guerro and Beniot may join.