We had many seasons destroyed by too strong PvE gear. This time at least the legendaries will not be an issue as Blizzard made an awesome decision and set the legendary cloaks (obtainable in patch 5.4) to not proc against players.
In addition PvE gear will be scaled down to ilvl512 compared to the ilvl522 of conquest PvP gear. It's up for the debate if the very strong PvE trinket procs will outwheigh the new PvP trinket setbonus or not but there is reason for hope that the next and probably final season of MoP will not be based around PvE gear like S4, S8 and S11.
Thank you Mr. Holinka!