I've seen and heard many things about "The Avengers" movie coming out in 2012. Here's what I think they should do. Note this is not a list, just what I think they should do
1.Nick Fury Leading Them
I don't know about you, but I thought Samuel L, Jackson was a great choice for Nick Fury and should continue in "The Avengers." He should start off commanding the team and later have Cap take over before the final fight. This would work due to the fact that The Avengers are created before Cap, Thor, and Shellhead sign on.
2.No Antman And Wasp
I know a few people out there want the Wasp and Antman, but I don't see a purpose for them in the movie so far. They might make references to them in "Thor" or the "First Avenger," but they have never been referenced or even thought of in any of the movies so far. So adding them in would just make no sense.
3.No Skrulls
The Skrulls would need a lot more development to be accepted as the villains. It would be better to have Loki as the the main villain. Even though Thor could defeat him, Loki might have control over a source that needs all the Avengers to fight-- which brings me to my next item.
4.Hulk Controlled By Loki
The Hulk has shown that he can be controlled to a certain extent in "The Incredible Hulk" back in 2008. Since Loki could technically aim the jolly green giant to attack the Avenges. Then later have something happen for the Hulk to join them near the end for the final fight. I know that this couldn't be the reason that they form, but they could be together because Loki became more powerful so only Thor could defeat.
5.Easter Eggs
Marvel has made this a tradition in most of their new studio produced movies, and I say keep the tradition going. Have references to other Marvel movies; maybe a Skrull ship at the end for a sequel or Stark Tower being their headquarters. Just stick with that formula.
That's my thoughts on The Avengers. Thank You