Project Titan could possible be the codename for PUBG 2
A PUBG sequel is most likely being developed under the codename "Project Titan". This Battle Royale title appears on the list of all KRAFTON projects that the company is currently working on. The table also states that the game will be released both on PCs and consoles.
Project Titan is being created by Striking Distance Studios, the studio that is developing The Callisto Protocol (a horror in the PlayerUnknown's Battlegrounds universe announced last December). Information about KRAFTON projects was shared by dataminer PlayerIGN