Blizzard should release the physical copies of Legion a day early like they did with Overwatch.
Those who pre-order the collector's edition can't play until the game stores open (unless they do a midnight release, which mine doesn't) and can't play at midnight when the servers go live.You should be able to pick up your copies a day before the street date, just like they did with Overwatch. It's not like they'll be able to play earlier because Legion won't be live.