See, I guess I don't understand why they're bothering not to reveal the whole thing now. Hulk and Thor were obviously going to be in the new one. If anything, the shot of Vision is the bigger spoiler (even if it's been all over various news spots).
That said, I hope they plan on selling that poster, because I want to buy it.
On a related note, I'm curious to see how they're going to tackle and juggle the growing roster. It's a lot easier to do in comics, obviously. Heck, you can have a roster as big as 20+. I know adding only three members to the current six isn't a big leap, but it's still a 30% increase in people on-screen.