Ok, after 4th delay (12 hours waiting) its confirmed, this is marketing b*****t...
What makes you believe that? how is it a good marketing strategy to not let people play.
Giving keys, or just a hope, that you will receive a key is also good marketing strategy. "Accidentally" letting all to play beta for 2-3 hours and then stop servers for maintenance and making a lot of peoples wait and hope that after servers go live they will have chance to play without beta key is also another good strategy...
A lot of people weren't sure it was a bug though. Do you really believe everything Blizzard says (lol). A lot of people were hoping that they would surprise everyone with a chance to play. Some people logged in because others said they could, but probably didn't know nothing was said by Blizzard about it.
Really, I don't think anyone has anything to worry about. It was a mistake, and made a lot of people really happy for a short time.
DON'T BAN HAPPINESS!
Don't play stupid dude.
Blizzard has REPEATEDLY said there will be no open beta. REPEATEDLY.