Only double match xp, not double xp for challenges, so the majority of xp you gain won't be doubled.
SEVEN DAYS! Of completely pointless XP! Because they sure the hell aren't going to give you a bonus that might discourage you, even slightly, of buying the battle pass.
I still enjoy playing this game but if they are saying "heyy come get your mythic JQ skin" it does make one wonder how many people have yet to complete their battle pass to 80. Not good!
Was going to make a comment on how it's already two days into this XP week at the time of the article, but since Blizzard doesn't have anything about this event on BNET or in-game (at least for me), just bad marketing on their part (not surprised unfortunately). Appreciate the update regardless since otherwise I might have never known about it.