This would be nice and it isn't like there's nothing new they could draw from the last 10 years to add to the poster (other than Cosmic Ghost Rider, aka even more Punisher...). Even something like a Sam/Nova appearance (unless he's there and I just don't see him). 'Cause the Nova they do have looks like Rich or someone sporting the old look.
Low-key or not-so-low-key, I want them to resurrect Flash as Anti-Venom and put him back into space. (There's obviously nothing for him on Earth if all they really did with him was strip him of his Symbiote just to nostalgia it back to Brock, tease him with new powers and then kill him off like all my other favorite (meaning not Carnage) Symbiote characters...)
Another thing I would love to see in this new-era GOTG would be Hulkling taking up his new-ishly established role as Space King. That arc was a ton of fun in New Avengers, and now would be a good time to expound and follow through with that. If nothing else, he'd be more contemporary than most on that poster.
Unless you're one of the ones who seriously believes he'll stay depowered forever, that means little, especially by the time this roles around.