Well, the MK9 trailer was released 4 years ago, so who knows when it'll be out. Just be patient like the rest of us.

Well, this seems to (indirectly) answer your question:

Yads ereht tiegh ma eb ot cseirep #WHOSNEXT

— Ed Boon (@noobde) May 30, 2014
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Unscrambled is along the lines of "Three days eight AM to be precise."

As they're in Chicago, IL, I believe this would be 9am eastern time.