Mortal Kombat Kollection Online has resurfaced.
As spotted by Gematsu, PEGI has an entry for Mortal Kombat Kollection Online, due out on PlayStation 4, Xbox One, PC, Nintendo Switch, with a release date of 21st January 2020 and an 18-rating, as you'd expect.
Obviously that release date is incorrect, but everything else looks legit. Here's the official blurb: