@war_killer: If i remember correctly in one of the upcoming All New Invaders issues Bucky supposed death in Fear Itself is going to be addressed. As for him being apart of the main Avengers team it kind of makes since with what Bucky new role in the Marvel universe will be.
As for Bucky replacing Steve as Cap again I would be total against it. To me that would just be a back step in character development for Bucky.
Falcon begin Cap is incredibly lame. I understand Marvel trying to push the character right now especially after his popularity bump form Cap 2. But making him Cap is not the way in my opinion. They should just give him a new origin story.