One minor concern would be World PvP. If the item level of PvP gear is only 496, PvE gear might be very dominant here. To be fair with you though, I'm not that bothered with World PvP in the first place, so don't mind this at all.
We are well aware that this is a concern that has arisen from players regarding the recently announced changes. While we understand that this is an unfortunate sacrifice for the overall betterment of PvP, we feel that this change will improve the state of both competitive and entry level PvP. This means that more players will be able to enter into PvP and as such increase to competition and the attractiveness of this fun and exciting area of the game.
This doesn't mean that world PvP and duels will be ignored. We definitely understand that players are wanting more huge, epic and glorious PvP such as those that come from world PvP, we just don't feel that it's the right place with the faction imbalance that is present in such battles. We are also looking into trying to find some solutions that will help with PvE gear in duels as we have seen this is a concern as well.
I also would like to say how important world PvP is for many people, the sole reason I do arena, RBG's and get PvP gear is to be competitive in world PvP and be able to fight back in the world while doing dailies etc.
Now the PvP'rs who focus soley or mostly on PvP are actually going to be worse off when fighting other players in the world. While players who do not PvP at all and only raid are going to have an advantage. It's not fun when the PvP gear you've worked so hard to get is only useful when you zone in to an arena or a battleground. And is otherwise useless.
We completely agree. We don't want people who have worked so hard to get their PvP gear to be left out in the cold for world PvP either, but we feel that the overall benefits that this will provide are greater than the issues it creates for World PvP.
While we do want World PvP to be an enjoyable experience for everyone, we are primarily concerned with instanced PvP. The reason for this is because world PvP generally comes down to ganking and the number of players on either side. This is not to say that we don't want World PvP and massive, out of control battles to flourish though, we are just not sure that something that suffers from major drawbacks such as faction imbalance is an optimal location for this.
tldr: they are scaling all pvp gear's ilevel down (higher level pve gear scales down when you zone into a pvp instance). In wpvp pve gear > pvp gear, because they are removing all resil from pvp gear and giving everyone base 65% resil, and it will be a higher ilevel.