I remember Blizz making honor gear more powerfull than last seasons conquest gear and it was a cause of a lot of rage from people having to farm BGs again to buy the gear they already bought trough arena play.
Do not reduce ilvl on 5.2 honor (Manevolent) gear. Do not remove the item upgrade NPC, just make him not able to upgrade any new Conquest/Valor gear (but still able to upgrade 5.1 gear).
After all this years you still do not understand how to manage PVP. Instead of reseting MMR at the start of every new season, you always put somebody in the role of an underdog.
If these changes go live, everyone who is not full Manevolent 2/2 upgraded will be falling behind for at least 2 and 1/2 months untill they get full 5.2 Conquest gear. That is a bad design choice.
I know there is a blog coming up this week to explain the gear changes, but the energy and time you have put up in changing this is just not logical. Leave things as they were, let people have fresh start at the start of every season and go do more important stuff like balancing the game or dealing with the bots, or making possible for us to actually blacklist a map, since that feature is not working atm in live.