https://youtu.be/d7u8vKLjwZM?t=12m20s speaks about it more in-depth.
He says that item levels will not be normalized (no scaling of your gear, pvp-ilvls etc), this is utterly retarded and forces all PvPers into Mythic raiding to get BiS gear, for PvP. It would be the WORST gearing solution yet, worse than TBC, worse than mandatory Ashran/RBG.
They cannot possibly go through with this, have they learned nothing from the shitstorm we just gave them about Ashran/RBG?
Lets assume ilvls are normalized though (they will be, even if the expansion goes live with them not being, it will change quickly - shitstorm).
You are right in what you're saying with the exception that gear itemization may heavily favor some items which are exclusively found in PvE raids, since everything will scale (hopefully) you're fine with doing LFR to get that stat combo you want. However some very rare stat combos might only be available from say Heroic/Mythic, I'll quit the game for good once the day comes that I have to do (serious) PvE content again to get BiS gear in PvP.
We'll also have OP broken trinkets and legendaries etc back in PvP again, they'll have to tweak every single OP raiding trinket for PvP.
Also this "solution" has the same obvious flaw as mandatory and RNG Ashran/RBG - if you're unlucky you might never get BiS.
This is simply put a shitty implementation.
No RNG, No PvE. Please.