Announcement posted not long ago. It's the usual boosts: 2x for P2P, 1.2x for F2P: It will run 12:00 game time on the 25th through 12:00 game time on the 28th.
72 hours of XP-boosted excellence - coming your way next month. Start preparing now for RuneScape's next Double XP Weekend!
From the moment the in-game clock hits 12:00 UTC on 25th September, all RuneScape members will enjoy double XP from their training until 12:00 UTC on 28th September. Free players won't miss out, with +20% XP on their training over the same period.
Double XP weekends are some of the biggest, noisiest, XP-firework-filled fun you can have in RuneScape, so don't miss out – get prepped now by stocking up on charms, vials, seeds or any other supplies you need for the biggest gains.
The weekend will be just one part of a September packed with community events and competitions – look out for more details in the coming weeks!
Now cue the waiting for what will and won't stack with BXPW. I'll add stuff to this post as we find out if you guys like.