I don't know what it is about the word "prototype" that people never seem to grasp on here.
The figure needs some tweeks, that is for sure, but I'd say at this point there is almost no chance it won't be screen accurate for the final product. At least it better be for the investment.
Anyway... If the article from ew.com that accompanies that cover is anything to go by,
it appears that Marvel has dropped the "Mark 50" designation for this armor and are actually going with "Bleeding Edge"... Seems fitting, though I could care less at this point. At least people will shut up about that name now.
https://ew.com/movies/2018/03/08/avengers-infinity-war-iron-man-armor-robert-downey-jr/
I'm kinda hoping it was just ew's writer taking liberties and assuming it's going to be called that like so many fan boys for the past ~6 years, but I don't think they have a reputation for stuff like that.