More info at Battlefield.com
"4 New Maps, Brand New Vehicles, High Tech Gear"
Fight for dominance across the vast and majestic Chinese mainland in four massive maps, using all-new vehicles and high-tech military equipment.
This is the expansion pack that you'll get when you pre-order Battlefield 4.
Update 1:
Sorry to bump this, but two quick notes:
From the official BF Twitter:
https://twitter.com/Battlefield/status/339045165773750273
@eeeeeeeelost Drone Strike was a working title. We're happy to announce the name of the expansion pack will be Battlefield 4 China Rising.
So it looks like that name/expansion is out of the picture. Definitely a good move, as that just wasn't a good name to begin with, not to mention the political issues that came with it.
Also, just like Karkand, China Rising won't be out day one, but "some time" after BF4's launch. (i.e., December) (From their FB page)
All who pre-order #BF4 will get the upcoming expansion pack Battlefield 4 China Rising at no additional cost. China Rising will be available sometime after Battlefield 4.
Looking forward to all of the MP goodness we'll be getting at E3, really sounds like they want to come out guns blazing. Hopefully it isn't nearly as lame and disappointing as their showing at E3 2011.