Test servers opened with new content
The game dev team welcomes everyone to join fun on test servers: they have announced they have uploaded there some yet undocumented content.
PC players, our test server is now open to test the stability of upcoming changes. There is some new content included that we will be sharing more information about soon.— PUBG Help (@PUBG_help) March 21, 2018
They are probably preparing themselves for the one year PUBG anniversary in Steam. Some users have noticed this tab in the main menu for a short while.
So probably tomorrow after the maintenance we would be ready to test everything they have been preparing for us.