It appears that someone managed to hack Battlelog last night. At around 3:30 PM EST games were unable to be joined and the poll at the bottom of Battlelog was for BF4 beta. DICE and EA were quick to react and everything seems to be back to normal. According to Battlelog developer, DarkLord7854, logins are safe and no data has been compromised by this attack. EA will most probably issue an official statement in the coming hours.

At around 3:30 PM EST, players were unable to join games, and a poll in broken english went up at the bottom of Battlelog for a Battlefield 4 beta, sending voters to a password stealing scam site. It also featured the option of...well, you can see it below, as to why players may not have signed up for the supposed beta. 

Tempting as some of these offers may be, never let yourself fall victim to someone trying to get a hold of your personal information. And as far as Battlefield 4 is concerned, according to EA's actual Battlefield site, "The team at DICE is hard at work on the next entry in the Battlefield series. While there is no further Battlefield 4 news at this point - remember, if you don't see it published here, it's just rumor and speculation."