On one hand, that seemed to be a joke.
On the other hand, though, if it is
actually going to be a thing, then things could go just like they did with the DC Vs Lupin III movie, back in 2013. There was a reveal trailer for DC Vs Lupin III that accompanied Movie 17, and then it released 8 months later, in December. If this happened again, we could expect a MK Vs Lupin III reveal trailer accompanying Movie 24, and then a release in December 2020. That's the only way I could see us getting an MK Vs Lupin III movie in 2020.
“Life is infinitely stranger than anything which the mind of man could invent. We would not dare to conceive the things which are really mere commonplaces of existence. If we could fly out of that window hand in hand, hover over this great city, gently remove the roofs, and and peep in at the queer things which are going on, the strange coincidences, the plannings, the cross-purposes, the wonderful chains of events, working through generations, and leading to the most outre results, it would make all fiction with its conventionalities and foreseen conclusions most stale and unprofitable.”
“Education never ends... it is a series of lessons, with the greatest for the last.”
― Arthur Conan Doyle, The Complete Adventures of Sherlock Holmes and His Last Bow
"I have decided to stick to love... hate is too great a burden to bear."
— Martin Luther King Jr. (A Testament of Hope: The Essential Writings and Speeches of Martin Luther King, Jr)