We have 7 characters, in the end there will be only 6, who one, and why ?
I don't think he will die, because in first time we will have THE movie : Civil War, and in the comics book Captain America really die at this point (for the moment), i don't think he will die.
In the same way, he will be in Civil War.
The is one who can die, and when i say die i say disapear. Thor : Ragnarok will coming and the death of Thor with it, but not in Avengers 2. He could disapear to protect Asgard but not diying.
Another one who can die, but this time he could really die. I thought he could die to stop Ultron, just like a boss.
Again another character who could die, she must hide himself, so what best hide is the death ? You had understand me she could "die".
The big one for me, why ? in the comics book the first team split up when the scarlet witch lost the control of her power and kill Hawkeyes, the character will not reappear before the Civil War.
This one could disapear (because we can say it he can't be killed) in the teaser we see him fighting (maybe under scarlet witch's control) the Hulkbuster, then he could probably be sent into space and then a movie with only Hulk can be made : "World War Hulk" and this could gonna be legeeeend ... wait for it ... daryy.