Bornakk says the Warriors will have a fix on Patch 2.4 to correct the Endless Rage values to mirror what the tooltip for the ability contains. Apparently, something wasn’t reported during PTR and now it was detected based on fan feedback at the Warrior Discussion forum. No ETA on Patch 2.4 PTR was provided, but Bornakk says its release is getting closer.
Bornakk: The fix in 2.4 should have Endless Rage provide significantly more rage. We don’t have any exactly numbers to share, but it should be a notable improvement from what it was providing to get it on par with what we wanted. Just to clarify the tooltip/functionality of this talent is not changing.