Looks like 5.4 will be divided into two seasons: S14, The Grievous Gladiator, and S15, the Prideful Gladiqtor (confirmed a while back),
If I had to guess, S15 will be a chance to allow PvPers to catch up with raiders in terms of item level, as well as be an inital test for the new patch 6.0 PvP changes.
Your thoughts?