Pretty cool, there absolutely could be new moves that haven't really found their way into MMA particularly yet even though at this point there have been probably hundreds of thousands of MMA fights in MMA history. Anderson's front kick to the face was really a paradigm change in MMA because now you see guys throwing it all the time. Of course there are a lot of low % moves that are not worth throwing too often like a rolling thunder kick or some of those crazy spinning Taekwondo kicks.
I had sometimes wondered about the legality of strikes with the outside of the hand to the side of the neck, aka a knifehand strike or "karate chop" to the side of the neck. In fact, the carotid artery on the side of the neck I think if struck with the side of the hand like this could be severed or ruptured causing death.
There was an Australian cricketer who took a cricket ball to the side of his neck and died, Phillip Hughes. Technically the current rules of MMA prohibit throat strikes (front of the neck) and spine strikes (back of the neck) but I think the side of the neck is a legal target, but I am not an MMA lawyer.
EDIT: I should also say it might not be a karate chop, I mean the knifehand side of your hand where your thumb is on. There is a strike like this taught in Ninjitsu, although I realise almost no MMA practitioners come from a ninjitsu background.