According to an Instagram comment from Kim's makeup artist, Mario Dedivanovic, the surprise may be...
Wait for it...
!! A CONTOUR KIT !!
Asked by an Instagram commenter about his favorite contour kit, Dedivanovic cheekily responded with "something secret."
Beauty news account Trendmood posted screenshots of an exchange that resulted in another fan replying, "AHH! You just spilled the beans! Kim's 'surprise coming soon' is a cream contour palette for @kyliecosmetics."
And while it's just a theory, we can't help but wonder if it's true...
After all, Kardashian and Dedivanovic put contouring on the map.
Trendmood also pointed out how subtle the makeup is for the KKW x Kylie campaign.
It totally fits Kim's current beauty vibe, which, naturally, is contoured to the gods.
And there is something on the Kylie Cosmetics website that adds even more credence to the contour kit theory.
If you scroll down the homepage, Kardashian and Jenner's profiles are the gateway to the site's face category.
Coincidence? Maybe, or maybe not! Only time will reveal the truth.