https://www.gamespot.com/articles/playerunknowns-battlegrounds-desert-map-wont-be-sm/1100-6452960/

Apart from a couple of early screenshots, we've seen virtually nothing of the next map coming to Playerunknown's Battlegrounds. Developer Bluehole has said that it's still a long way off from release, and many issues still have to be worked out. However, it looks like players can expect the desert map to be just as big as the original.

In an interview with Eurogamer, Brendan "Playerunknown" Greene revealed that the locale will be 8x8 kilometers, the same area as the currently playable map. Bluehole had originally intended to make the area 75% smaller--only 4x4--but changed its plans.