This is really to add to a discussion going on in the Simcraft thread (that shouldn't be in there) about deep destro specs after the patch.
After trying out a 0/13/58 build yesterday I'm pretty impressed. It does very good single target DPS which is great when you need to burn something fast like XTs heart or Razor on landing phase (as you can guess I'm not in a guild that is clearing Yogg just yet

). I still think that I'll be spec-dancing for the time being and doing what's best for the raid overall. On fights with a lot of adds then the AOE from deep destro is still comparatively weak compared to affliction and 40/30+1 hybrid builds.
Overall it's a huge improvement from where deep destro was before 3.1.2 but anyone hoping for the easy and overpowered DPS of the old 21/40 days is going to be disappointed. Right now destro is raid-viable nothing more, which is probably where the developers want it to be.
EDIT: and yes, threat is again an issue. I found myself skirting tank threat for the first time in ages, but that just means they get to work a bit harder.