It is working on the PTR, the best way to tell is to judge and then reseal at almost exactly the same time. Without a stopcasting macro, on live you'll get an error saying you are performing another action, and your seal won't cast.
Currently in the PTR, you get a rather odd effect, you will be resealed but the client will not register it, so you can't see the global cooldown that it caused or any seal animation. I tried to take advantage of it and piggy back a holy shield after it, thinking that the client doesn't know that the global cooldown is active and it'll let me cast, unfortunately, the server is too smart

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