Nothing revolutionary. The key to the long toss is throwing on an arc as you move out in distance. This ensures that you are only throwing hard enough to reach that distance. As a result your warm up is guaranteed to be gradual. The other part is then throwing on a line as you move back in while maintaining the same intensity you had at full distance to re-establish the release point.
Most of the concept of Jaeger's long toss, arm circles and tubing exercises is based on prehabilitation. He's taken the exercises that one would do to rehabilitate an arm and worked them into a program to condition the arm.
Throwing on an arc is especially important when rehabbing an arm. If you try to throw on a line you have no way to measure how hard you are throwing the ball unless you've got someone there with a radar gun, and it is easy to overthrow and reinjure the arm, but if you throw on an arc then your distance becomes the measurement of how hard you are throwing. That's the whole concept behind an interval throwing program.