I could just be falling for some general O-boards nonsense, but
according to this post, the latest version of the PTR has flight form having a 3 second cast time. I would have thought that something like this, if real, would have gotten a bit more attention, or at least have been found sooner, but thought I'd mention it, even if someone who's on the PTR can post confirming it's bullcrap, so I can jump off cliffs and fly away without worry.