They said their resource use will be fundamentally changed to not be effectively infinite. That means there will be minimal use of damaging spells and more use of mitigation spells. They also said they want to increase their damage output.
I can not confirm it, but I suspect this means warrior tanking will be fundamentally different in feel. It will probably feel like a very high damager that mainly cares about its mitigation in abilities.
I might yet play that alt warrior I have if it becomes very interesting.