Thanks for the submission,
Salutreguix! However for release DLC release dates we use the date that the content becomes available for all users to download from the marketplace. In this case the
Omen in Killer Instinct is only available to those with certain editions of the title and isn't intended for individual sale at this time. With respect to this we haven't altered the release date, although if it ever does become downloadable for all players, we'll be sure to add one!
Thanks again for the submission!