Sadly, it doesn't look like there will be an AF appearance. In the comments someone addressed the "X-men Flight" image.

The "Canadian X-Men" image is indeed just fan art created by one of the show's artists. He did it as a thank you for working on season 2. Here's his quote.

"Portfolio: Avengers EMH crew Gift Poster…
Hey Folks. This is a crew poster I did for the folks I worked with on “The Avengers: Earth’s Mightiest Heroes” upon the completion of my duties when we wrapped preproduction on episode 52. Sort of a “What If” scenario that was never addressed in the show. I had a good time working on that production and so I drew this for my friends with whom I enjoyed working.

Cheers."