So, there's a BF3 calendar, I'm going to update here, you can probably find it elsewhere, but I didn't know monthly double XP weekends for Premium members.
4 DLC over next 10 months (we know, obviously), which is 2-weeks early if you're Premium
Unique in game content, no obvious pattern to it, though there's 6 lots of it planned
4 strategy guides planned over the next 10 months
Monthly premium events, which includes double XP weekend every month and a undisclosed Premium event every month starting in August
Monthly videos
4 lots of Bonus content, no more info on this
No info on price anywhere, this is only due to the back-end not being updated yet. Though I think it's been confirmed in the 40-50 euro range? I don't know, if those I play with get it, I probably will. I've spent 230 odd hours on the game, if those I play with aren't going to stop, then I might as well.
Server side hasn't been update yet, so can't test out the patch until the back-end has been sorted, but we knew that. Be nice to be able to have a fair chance in dog fights with the F-35 now.