#12 - Sept. 13, 2011, 5:03 p.m.
This was bad information. They confused requirements to post in the forums to requirements to be able to opt-in. They're not the same.
To opt-in you need to create a Battle.net account and attach
any Blizzard title that has a CD-Key you can attach. If you're opted in then that means you do have a game attached, and you're all set - you're in the pool to be selected just like everyone else.