Test server build is deployed to live servers
It took just a few hours for the developer team to figure out that the build on test servers is stables and ready for the common mass of players. They decided to deploy it to live less in a day it was uploaded to test. They have announced it in their twitter account.
PC players, there will be a 3 hour maintenance period on our live servers starting at Apr 4 7PM PDT / Apr 5 4AM CEST / Apr 5 11AM KST. We will be moving our current test build over to live.— PUBG Help (@PUBG_help) April 4, 2018
Right now the servers are on maintenance period but we expect them to go live earlier then expected. However there would be probably some issues after uploading the build so better stay off PUBG for a while.