First thing I would like to note that blood shield stacking is capping at players maximum health. I am not sure that its ever had a cap such as this, although I do vividly remember stacking it to 400k while soloing hyjal pre 4.3.
Another thing I would like to point out is for some reason I am seeing a lot of crits taken in the new instances and raids. I do not have logs (yet), but I have seen being crit on Murazond, multiple trash pulls in all three new five mans, the ooze boss and ultraxion (Both ten man normal modes).
I am wondering if these are known bugs as of current or if they are new. (And yes, before you ask I am specced for imp blood pres, that's why Im asking this question.)