Ah sorry sorry. There are a lot of chests in WoW these days!
Here’s what is said in regards to the weekly PvP chest:
Season 2 rewards from rated PvP sources are 30 item levels higher than they were in Season 1, including Conquest rewards and the weekly chest.
So if you’re in the Gladiator bracket and currently receiving a 385 item level piece of loot, then that will be item level 415 going forward. However, during the initial week – meaning Wednesday tomorrow – the same restriction applies as to the Mythic+ end-of-week chest, meaning that the loot will be capped at item level 385. But afterward it will be uncapped and can scale beyond item level 385.
Does this make sense? It’s a little bit confusing, but item level 385 is the highest you can get tomorrow (which everyone should get if they cap their Conquest). And then the weeks afterward the chest will scale as per usual, up to a maximum of item level 415.