So who are the villains? Who have they chosen? Are you really ready for the spoiler? Turn away now if you don't want to know......I'll wait......
It looks like it's going to be Loki and the Skrulls. No, that's not the name of an 80's cover band. Those are two separate things. Loki:
is Thor's half brother, and a trickster god. We will be seeing Loki in the Thor movie coming out this May.
are a race of aliens that can shape-shift into anyone they want to be. Also, by getting a genetic sample, they can incorporate any powers from that sample into themselves.
So there you have it, kids. Loki uses either the Cosmic Cube (which we will see in Captain America in July) or the Infinity Gauntlet to get the Skrulls to invade Earth, causing the Avengers to be formed. Pieces of the story will be laid in both Thor and Captain America (both coming out this year) only to be picked up and tied together in the Avengers in the Summer of 2012.
Wanna know more about these storylines? Go to your friendly neighborhood comic book store to find out more. Why? Because reading a synopsis on Wikipedia is not only boring, but makes you look like a cheapskate.