WMG / Battlefield 4

The following maps will return for BF4
DLC 1 China Rising will include Wake Island, because we really need this massively imbalanced map in a battlefield game for the 15th time, and Songhua Stalemate because it will be quick for DICE to re-make. DLC 2 "Second Assault" will include Metro, Caspian Border, Grand Bazaar and either Seine Crossing or Damavand Peak.
  • Second assault confirmed as Firestorm, Oman, Metro & Caspian.

There will be a map in Yosemite.
One of the landscape shots released looks rather like El Capitan.

The reason why the Russians are fighting the Chinese in multiplayer
The Chinese forces that the Russians encounter are a splinter faction of the PLA that supports Jin Jie. Presumably, Admiral Chang's faction, which is concentrating on fighting the American invasion of the coast (All the USA vs Chinese maps take place either in urban centers or islands along the coast) requests support from the Russians, whom they are allied with in the campaign, to deal with the insurgents in the interior of the mainland.

The nuke at end of battlefield 3 actually went off
It was on a timer, exploding seconds after Blackburn reached it. This explains why Russia and the US are at war; the evidence, witnesses and the two people who knew were at ground zero of the nuke, which also explains why Blackburn didn't make an appearance in Battlefield 4. Kovic's survival was due to the distance the train covered when Blackburn was on it, meaning he was outside the nuke's blast radius.
  • I think the novelization for BF 3 mentions Blackburn being pardoned... Then again he wouldn't need to be alive for that to happen.
    • I think the Novels are actually in a diffrent continutity: Matovik never turns up, and France isn't nuked.

The conflict in Battlefield 3/4 will go on all the way to 2142.
The Last Stand seems to be setting it up with hovertanks, railguns and the already existant Russo-Chinese alliance.