DICE has confirmed Battlelog will go down today until an hour before the EA E3 press conference.
It'll go down at 3pm GMT this afternoon until 8pm GMT tonight (7am-12pm PST, 10am-3pm EST, 4pm-9pm CET).
It's expected that Battlefield 3 Premium will launch during the EA presser. Official details are set to be confirmed then.
A trailer for the service got out before the show last night, detailing some of the services on offer with it.
Get the details for the EA press conference tonight here.