I have not been on the PTR to test out the new DS numbers, but assuming a raid boss is hitting me, 80% of all the DS healing will be over healing (as it has been in the past when ive tried it. OB hits just to hard with top end gear to not use it IMO. So, for a blood rotation I would be taking Annihilation. Maybe it turns out that DS's healing will not all be over healing and hit for say 80% of OB. But even then, it takes a min of 4 talent points to 3 point to use OB. To me, OB > DS overall.
MoB is not really going to do to much on a hard hitting boss, but then again, it is another helpful CD for only 1 talent point (which I can steal if I use OB)
Spell Deflection works on DD AoE damage (it works on Sarths Breath). It does not work on DoTs.
Blood Gorged is also pretty much useless for the MT. Its more of a flavor thing than anything else. I would rather put those points into Scent for Blood for more DCs and RS (works close to how BoSanc works)
I cast the spells that make the people fall over.