Mortal Kombat 11?s Joker won?t become available until January 28th but a few YouTubers have been granted early access to the character, resulting in a number of gameplay videos floating online. Thanks to these videos, fans noticed an exchange that happens when Joker goes up against Joker, and it sounds like a tease for Injustice 3.
The exchange goes something like this (thanks, Eurogamer):

PB = PB || {};
PB.gptStandAlone = PB.gptStandAlone || {};
PB.gptAutoRefresh = PB.gptAutoRefresh || {'gptAds':[], 'gptStandAlone':[]};
admiralCookie = readAdmiralCookie();

googletag.cmd.push(function() {
var standAloneSizeMapping = googletag.sizeMapping().addSize([0, 0], []).addSize([750, 0], [[300, 250]]).addSize([980, 0], [[300, 250]]).build(); PB.gptStandAlone['ros_300x250_p_slot4_1580050977'] = googletag.defineSlot('/4403/cr/playstationlifestyle/ros', [[300, 250]], 'ros_300x250_p_slot4_1580050977') .defineSizeMapping(standAloneSizeMapping) .addService(googletag.pubads())
.setTargeting('pos', 'P').setTargeting('content_detail', '0').setTargeting('kw', 'in-article').setTargeting('coppa', '0').setTargeting('site', 'playstationlifestyle');
googletag.enableServices();
googletag.display('ros_300x250_p_slot4_1580050977');

if (admiralCookie === null || admiralCookie['val'] === 'false') {
googletag.pubads().refresh([PB.gptStandAlone['ros_300x250_p_slot4_1580050977']]);
}

...