It looks like blizzard has opened the wod beta servers for no reason at all. Some insiders say they are preping them for a gamescon new expansion gameplay.
Also no one knows for sure what patch are the servers running atm.
I think its safe to say they are also not using the beta servers for the next wod patch as they usually use those patches on ptr or internal servers.
Here's a link of a known website that ppl used to check if the realms are online when wod beta was taking place. Beta server status
what do you think about this ?