Jumped on the PTR to test things.
With Dracthyr you can definitely cover some distance with the double jump. I had a guild mate race me in a straight line and it wasn’t even a contest. The only thing I dislike is that it gets a bit tedious constantly having to mash the spacebar.
They racial passive was nerfed: it’s just a flat +1% mastery bonus.
Sustained Prophecy pauses your Apotheosis/Void Form for 20s after combat and you can reset your Holy Words because you’re still treated as in Apotheosis. Also, your Apotheosis/Void Form timer still resets.
You can literally just sit there and reset your Holy Words to full before jumping into combat and abuse Shadow Meld. 1-2s left on Apo? Shadow Meld in the back, reset your Holy Words, and then go back in.