The email sent to many World of Warcraft players in North America and Europe indicates that Warlords of Draenor's beta will start at 2 PM PDT today. These players are allowed to start downloading the files now in preparation.
"As a beta test participant, you'll experience the new content and features of Warlords of Draenor before the expansion is released," the email says. "Over the course of testing, you’ll venture through the Dark Portal, establish your Garrison, and fight back against the Iron Horde!"
"While you prepare to embark on your journey, keep in mind that Warlords of Draenor is still in development, and additional content and features will be made available throughout the beta testing process. For an overview of what’s currently available in this phase of beta testing, head to our beta forums."
There will be non-disclosure agreement for the beta. Testers will be free to share gameplay videos and screenshots. Be prepared for a flood of new information on the expansion from these early testers.
Beta invites will be given out to players who have opted into testing through their Battle.net account. Blizzard community manager Bashiok says that preference will be shown to long-time WoW players.
First #Warlords beta invite wave on its way! Check your account for flagging. Targeting first wave toward WoW veterans. (Realms up tomorrow)— Bashiok (@Bashiok) June 27, 2014
@ReliqEU I would prefer not to. :P It's not a guarantee if you meet x/y criteria, just an attempt at a targeted group, vs. more random.— Bashiok (@Bashiok) June 27, 2014
It's unclear whether you'll need an active subscription to actually play the beta, though. I remember that being the case for Cataclysm at least.
You can wait for the emailed beta invite or check your Battle.net account directly. The latter approach is better. Bashiok says that emails aren't sent out immediately after your account is flagged for beta access.
Blizzard handed out several beta keys at PAX East earlier in the year. Bashiok says that players with these keys won't be able to use them just yet, though.
.@kn42 We'll announce when the PAX East keys are enabled. Not quite yet.— Bashiok (@Bashiok) June 27, 2014