https://www.pcgamer.com/pubg-shares-before-and-after-blue-zone-shots-adds-new-weapon-in-pc-update/

PUBG's latest PC-specific update—the 23rd since launch, for those counting—adds a new pistol, and tinkers with its blue zone's visuals. The former, named Skorpion, can be spied above. The latter stars in the images below. 

In a bid to make it "less difficult to see through", the blue zone's opacity has been adjusted. Likewise, PUBG Corp says it has "mitigated an issue where the blue zone’s opacity difference was too strong depending on the map and weather type."