They are accepting pre-orders and first deliveries are expected in the second week of April. You can either get the modification performed on your camera, or buy a converted camera.
There's also a Canon 7D-PL FAQ.
...the 7D-PL Mod performed by Hot Rod Cameras will void Canon's factory warranty. However, there is a five day new camera initial failure policy. Customers have 5 days after their invoice date to notify us of an initial failure.