We also now know what's going on with FDCL. Basically, SoD has a 1sec ICD now, so you can't ever get a double-proc (from initial VT tick and a Mastery), but is still supposedly a 15% proc chance...though this isn't entirely accurate, as it is a 15% chance on Hit or Mastery, not both. This means in multidot situations we see a lot fewer procs, which effectively kills it as a talent choice (MBender was on par with it before in 1-target, and it is lousy with each extra target added).
Oh well. At least we know now. I'll try to math it out to give an idea of the 'real'/effective proc rate based on Mastery later this week.