Yhar, especially with the BoSanc change, youre definately gonna want scent for blood, it will be one of your larger threat generators.
Also agree with not getting glyph of disease - if you think about it logically youre giving up a HS/IT/PS in favor of 1 death strike and 1 gcd (remember pestilance no longer deals any dmg), and you can only even use that spare gcd for a death coil... AND you also need to keep IT in your rotation if you use the EoH def sigil.
But as for Subversion, it there was some calculations done in the Fireside chat that showed that subversion was about 30% or so better than Sudden doom point for point, even with morbidity and Glyph of Dark Death, so i figure personally ill drop all 3 of those and get Subversion, and glpyh Vamp Blood/RS/DS... alot of ppl underestimate the rune strike glyph, assuming RS is 40% of your threat and a 20% crit rate (buffed), then the glyph is something like 3.4% of your total threat.
And MoM is a big factor to the added threat on crits, i cant see ever dropping it - it affects all your rune strikes.