Loki Vs. The Avengers?

Loki has to be in the Avengers.  He has always played such an intergral role in the team's formation, and was even their first villain.  And if rumors are to be believed, Loki will be fighting the team, and he'll be bringing help.  Apparently in the form of the alien Skrulls.  And he'll be using the cosmic cube to do it.

For the record, Loki should not be "the" villain.  He's Thor's archnemesis, not the archnemesis of the Avengers and the entire Marvel U.  The Avengers need to fight a villain that no single one of them can stand against alone, and Thor has beaten Loki one on one more than once.  Nevertheless, he should be a villainous character who does go acting like a giant asshole.  As for the Skrulls?  They're tricky to set up and explain, but offer a wonderful threat for the team to face.  I have no idea why Loki needs the cosmic cube, and I'm unsure of that part being true.

Another fun rumor is that there will be an Avengers teaser trailer in front of Captain America.  This is something I'm really hoping to be true, just to get some early buzz for the movie.  Pretty soon the movie will even start filming.  What a scary thought that is...