PlayerUnknown's Battlegrounds is a bit of a mouthful, but at least the game has a handy acronym of PUBG to make things a bit simpler. What's that, they've tacked an extra bit onto the end? Oh.
It appears that Krafton has re-branded PUBG to PUBG: Battlegrounds - with the new name now appearing on the game's social media feeds and Steam (via PC Gamer). That's right, it's now PlayerUnknown's Battlegrounds: Battlegrounds.
This apparently happened sometime in July, and appears to have something to do with Krafton's plans to create a PUBG universe.