Not sure where you are getting 672%. I'm seeing 411% to 700.8%. (I only read from the post, I don't know the actual live numbers, which is what I assume you are looking at?)
Which is crazy, nearly doubling the damage of rupture. I wonder what spot this will put us in overall? I already thought I was doing alright, but I'm no Mythic raider and maxed out at 28k (I'm 658 with 645/640 wep *Cry* blizz hates me) sustained in Heroic HM, and I see much higher numbers from other classes.
Looking forward to it. Hope to see this going through sooner rather than later.