Here is the Tweet from NRS' Twitter page, which also includes a link to an FAQ from from WB Games' Mortal Kombat Support website, with all the details you need to know about this beta.
This is huge news without a a doubt, only very few games get to have an online Krossplay between two separated consoles, and none of those so far were from the Fighting Game genre. While Street Fighter V had a Krossplay between PS4 and PC, Mortal Kombat 11 is the first Fighting Game to add Krossplay between two separated consoles, the PS4 and XB1. That goes to show how big, important and successful MK11, and this might open the door not just for other platforms to be included in that feature for MK11, but to have other fighting games to include it as well.
Stay tuned for more updates on the manner, and if you play on either PS4 or XB1, feel free to test the online Krossplay feature for MK11.
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