If you use UBI as your game client, you'd know immediately even without an e-mail if you were selected. Since the Beta pre-load appeared on your games library on the 5th. And you could start downloading on the 6th (yesterday). I have a friend who didn't pre-order but registered and did get in, so they aren't limiting patricipation to pre-orders. I also got an invite on my second account, which I didn't need since I pre-ordered on my primary account.