Wow, this seems amazing, I think this is what most people wanted to see happen seeing as the price of corpse dust is quite cumbersome.
For you that don't know, they changed it so if you put a point in Master of Ghouls your ghoul becomes a pet and doesn't get de-summoned, but if it is killed you have to wait for the CD to get another ghoul.
Seems like a terrific change to me.