New Call of Duty leak says a Halo crossover was headed to CoD: MW3, but never saw the light of day. Could it come to Black Ops 6?

According to a new Call of Duty leak, there were plans for a Halo collab in Modern Warfare 3 at some point, though it was never released.

source https://www.windowscentral.com/gaming/new-call-of-duty-leak-says-a-halo-crossover-was-headed-to-cod-mw3-but-never-saw-the-light-of-day