#2 - Jan. 27, 2015, 1:10 a.m.
We worked out a new fix that won't require any downtime, and it's set to be picked up with restarts tomorrow.
Assuming everything goes off as planned, those who completed the Primal Fury quest before it was fixed (and thus haven't received a Thisalee/Choluna follower) will be granted the follower with rolling restarts tomorrow.