according to the boys at EJ, the rotations should look something like this:

single target:

Diseases > Ob if both Frost/Unholy pairs and/or both Death runes are up, or if KM is procced >
BS if both Blood Runes are up > FS > Rime > Ob > BS > HoW.

multi target:

HB if both Frost runes and/or both Death runes are up >
DnD/PS if both Unholy Runes are up > FS > HB > BS > DnD/PS HoW.

I'm clueless as how to model the prioritization in green in a macro..