The website http://battlelog.battlefield.com displays a sign in page for the “Battlelog Alpha Trial,” with a note stating “Try Battlefield 3 before anyone else.”
EA/Origin logins do not appear to automatically be authorized to log in; a message states “your account is not authorized to log in” if this is attempted. No details have yet been released on how the Alpha will be accessible.
Are you even sure this is a legit site. Maybe you just gave away your EA/Origin login.
Very smart move to do when no official announcement has been made!
This is a subdomain of the battlefield.com domain, which is owned by EA.
The only way this could be a phishing site is for a hacker to create a subdomain hosted on EA’s web servers, which while possible, is unlikely.