[warmachine6]

"UPDATE: Hasbro just sent word that the Black Knight figure shown this past weekend at the London Comic Con is actually part of a second wave of Avengers figures coming in 2018 and not part of the first wave which will include the Songbird, Classic Taskmaster and King Cobra as previously reported."

"We have gotten word that it was announced during the London Comic Con that the upcoming 6" Marvel Legends Black Knight figure which debuted there would include an alternate head sculpt featuring Nathan Garrett, who was the original Black Knight and a bad guy. We did some checking and were told multiple heads were sculpted for the figure but could not get a firm confirmation that the Garrett one did in fact make the final cut and be released with the figure, however if it was mentioned at the London Comic Con, we are going to assume it probably did. We will know 100% for sure once Hasbro gets around to releasing packaged images for the figure."

Source
EDIT: - added extra information.