Currently if you go to the newly launched beta site for AI.SE you'll see the:
To log in, you must have commited to the Area 51 site proposal and received the invitation email. Click the invitation link in the email to log in!
Which redirects to the old closed proposal from 3 years ago: http://area51.stackexchange.com/proposals/6607/artificial-intelligence
Instead of the new one: http://area51.stackexchange.com/proposals/57719/artificial-intelligence
Additionally since you can now participate in a site's closed beta by going through the "Visit the site now!" link. The wording on the log in description should be changed from "received the invitation email. Click the invitation link in the email to log in!" to reflect this.
Just to be picky: "commited" is spelled "committed" (you missed a "t" there).