Blizzard Support have updated their Twitter to confirm that wave 4 of beta keys has been issued. Emails have been sent but be aware of scammers as always. The best advice is to check your Battle.Net account management page to be sure, (emails can go astray too of course).
And if you’re on give us a “whoop whoop!”, if not, have some chocolate, it makes everything better. PM me if you’re in so I can change your forum title to Diablo 3 Beta Tester so you may strut about like cock of the walk.