Ah, if only. It's just a poster by Olly Moss. Not sure which of these it falls under: "Cancelled projects, alternate directions, abandoned sketches and bad ideas." Definitely not the last one.
Intriguingly, Joss Whedon has just revealed that Scarlett Johansson might not have been available for (The) Avengers (Assemble) so there was a draft that featured The Wasp instead.