Youtuber Westie has uploaded a video showing a nighttime variant of the wide open Golmud Railway, and mentions that a similarly gloomy variation of Zavod 311. They're live for alpha scrutiny on the consumer test environment, and seem to do a nice job of showing off the Frostbite engine's excellent lighting capacities.
Also there's a yeti. Players have discovered that on Golmud Railway you can go to the very edge of the map, shoot a distant shiny object on a mountainside. The shine vanishes and you hear a mournful yeti cry. In the test version of the map the cry seems to be playing constantly, because the yeti can't get any damn rest with this noisy war happening.