Devs have commented that they are creating EB3 as I am writing this, but I haven't seen anything that they have started Alpha Testing yet. I would love to be part of the Alpha Test, but I don't get much of a chance to get on the forums. Please let me know when it starts....

When did they announce this?

Sign me up as a beta tester too.

If it's like Egg Breaker 2, Bush Whacker, Bush Whacker 2, or (possibly) Egg Drop (I can't remember that far back!), they will announce when alpha signups are available. You apply to be an alpha tester, and voila - you get to play (and help debug issues). After a few days, alpha testing closes, all alpha user data is wiped, and (one or two days after that) the Beta opens for all.