There has been lots of MK news as of late. Joker releases next week, a new animated movie was announced and we could be getting a collection of the games released soon. Spotted by Gematsu it seems that PEGI, the ratings board in Europe has rated "Mortal Kombat Kollection Online".
This is presumably a collection of Mortal Kombat, Mortal Kombat 2 and MK3 / Ultimate Mortal Kombat 3 for PS4, Xbox One, PC and Switch. A similar collection called "Mortal Kombat Arcade Kollection" was released on the PS3, Xbox 360 and PC last gen. Unfortunately the PC issue was plagued with the dreaded Games for Windows Live.
Here is the official description of the game
Mortal Kombat Kollection Online is the original Mortal Kombat trilogy that MK fans always wanted. Upgraded art, gameplay, and online features provide an incredible experience that revive the “klassics”.
Here is a screen shot from PEGI's official rating of the game.
There has been no word or official announcement about this from NetherRealm or WB so far so this is just a rumor for now.