From the release notes
I have been reading this and wondered what exactly is meant by this or rather how will this effect party make up?Many raid bosses have grown stronger as a result of their numerous encounters with players. Many that did not have the following now do: True Seeing, some Metamagic feats, and some amount of fortification versus critical hits. They have also been given extra hit points and physical damage output. The amount of the increase is higher for higher level raid bosses, and for those on harder difficulty settings.
Seems we are going full circle and they are attempting to beef up the big guys. I really don't have a problem with this but it would be nice to see the mini-bosses and LTs also get a bump. However I left wondering does this handicap more classes in end boss raid fights?