It's for the cor roll obviously. They even have a picture of the roll on the announcement.
And this:
is wrong, so I'm not sure why it was rated up. Cure potency, and the "stats" (huh?) that affect cure potency are exactly the same. The only thing that they changed is the formula for determining the final cure value. Now the cure received effect is multiplied at the end of the equation (up to 30%) for a final cure boost of up to 95%. This final cure boost is what was modified, not cure potency (which is still 50%).Basically they are adjusting it so that you get a greater bonus when various stats that increase potency are stacked.