BFH will be moving to the Windrunner PvE realm soon! Do not quit the guild or transfer your characters until after the transfer is complete. After the transfer is complete each of your characters will receive in game mail with instructions on how to follow the guild to the new realm.

More information about this can be found at:
https://us.battle.net/support/en/article/guild-services
(select Guild Member Changes)

Blizzard also created a short video explaining everything at:
https://www.youtube.com/watch?v=FUHYXAYPvAE
(you can probably just skip to chapter 4)

If you plan on following the guild to Windrunner then make sure you are under the gold limit for your level (81+ is 50,000g). If you have more than 50,000g then you may use the guild bank to deposit your gold before the guild transfer and then withdraw the gold from the guild bank after your character transfer is complete (guild bank does not have a gold limit). Transfer will probably happen tomorrow or Friday!