So it turns out that this is happening.
EA has decided to launch BF1's open beta period on Legion's launch date, August 31st. It's cool and all but this seems to be a direct shot across the bow at World of Warcraft. Albeit WoW has done this to other titles for a long time now. I highly doubt the date was a coincidence, but it remains to be seen if people will want to play the queue simulator and disconnect game, or go play Battlefield's open beta.