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MAJOR SPOILERS FOLLOW FOR THE AVENGERS. DO NOT READ ANY FURTHER IF YOU HAVEN'T SEEN THE FILM YET!
The tried and true Marvel Studios tradition of inserting scenes with Easter eggs midway or after the credits of its films continues with The Avengers. And while the surprise reveal that comes midway during the film's closing credits -- right after the fancy actor roll call -- might make total sense to comics fans, there are surely a lot of you out there saying, "Just what the heck was that all about?"
Well, we've got you covered.
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I'm so looking forward to the avengers 2!
Honestly even if you didn't know who it was (which you should have gotten a good idea from the movie itself) you should still know its a bad guy coming for the next movie. Just like the end to Green Lantern, you don't need to know who it was to know what he will be doing.
As for this the only real thing that needs to be explained that isn't being explained, he is a powerful beast and the people that follow would absolutely destroy The Avengers in its current movie form. So more importantly than him appearing, is who will be joining The Avengers to help.
No need to say that these easter eggs at the end of movie trend will continue.
With that in mind, if in fact that Thanos is the main villain in Avengers 2, at the end of the next iron man, caaptain america, thor would be an easter egg of Thanos just sitting from afar watching and learning/ calculating the strengths and weaknesses of each.