At Blizzcon, during the Class Discussion Panel, the following was divulged:
Q: Will damage during threat generation be improved for Protection Warriors?
A: It is more fun to do more damage as a Protection Warrior while generating threat and that is being looked at.
I would love to see more damage as a Prot warrior, but this will be a fine line. Added damage is definitely a good thing, but up Prot warr damage too much and it will cause an imbalance on the PVP side of things.