http://eu.battle.net/heroes/en/blog/18141102?utm_content=external-sso&utm_medium=other&utm_source=AppQuote
As a way to say thank you to the community for helping us make Heroes of the Storm the best game it can possibly be throughout its Alpha and Beta phases thus far, we’ll soon be trying out a new method for sharing Closed Beta testing invitations, which will allow existing players to bring a few of their friends into the Nexus.
Essentially, a number of players will receive an email containing four Heroes of the Storm Beta Keys, which they can then give out to their friends and start brawling as a team. Initially, we’re going to send these Beta Keys out to a rather small group of playtesters. If everything goes smoothly with this trial run, we will expand this program to include many additional players over the weeks to come.
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It’s important to note, however, that this will not replace our existing Closed Beta invite waves, which we’re still sending out regularly. If you do not already have Beta access, make sure you’ve opted in to Heroes Beta testing on the Beta Profile Settings page in Battle.net Account Management. If you’d prefer not to wait for an invitation, you can purchase a Founder’s Pack to gain immediate entry into the Heroes of the Storm Closed Beta.
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If you’re currently participating in Closed Beta testing, you may wish to keep an eye on the email address associated with your Battle.net account over the coming weeks to find out if you’ve received invite codes. We hope that many of you who receive these invitations will enjoy playing Heroes of the Storm even more after introducing your friends to the game, and we hope that you’ll keep sharing your feedback with us as Beta testing continues.
Thank you very much!