While they say there is nothing new under the sun, Jason Snapp offers a clever new leg trap knee on belly defense that allows a fighter to turn the tables on someone who has them pinned on the mat with a knee in the belly.
By using the dominant hand to reach up into the rear area of the opponent and using the off hand to grasp their forward arm, it becomes possible to bump and roll them even while they assume they are in control of the situation. This is a very intriguing technique for fighters to keep in their bag of tricks for just the right moment in a match.
I tried this once at a tournament unsuccessfully. Watch the dismount back to side control trapping your bottom arm when you reach under.