Not yet. But Virginia has a case wending its way through the courts, its on appeal right now.
If the church incorporated as part of the Epsicopal Church in America then it will be bound by the canons and articles of the parent church. That is the point of all of these cases. When a church incorporates as part of an overseeing parent structure then there is always a pledge of fidelity to that church.
If you wish to leave the Episcopal church the best and most ethical thing you can do is walk away and establish your own church, affliate if you must but do not be surprized when legal issues arise