The Collector is one of the Elders of the Universe, which is a group of immortals that are each the last of their respective species, and each of which is obsessed with a single activity as a means of preventing boredom from overcoming their eternal lives. Shockingly, the Collector's hobby is collecting things.
The things he likes to collect include superheroes, and so he is a villain in the comics. As he is slated to appear in the Guardians of the Galaxy film, he will probably be the villain of the piece there.
In the comics he and
five of his fellow Elders each possessed an Infinity Gem, and these were taken by Thanos of Titan, who then used them to create the Infinity Gauntlet. This granted him godhood, allowing him to perform such feats as killing half the population of the universe; killing the combined might of Earth's heroes; defeating the cosmic beings of the universe (Including Galactus, the embodiments of time, chaos, order, love and hate and even Death herself, and a few more -- basically the Big Scary Things of the Marvel Universe); and finally it allows him to defeat the anthropomorphic personification of the universe itself and essentially become capital-G all-powerful God.
So the scene is likely to tie into the Guardians of the Galaxy film, and the eventual Thanos plot (which will presumably culminate in Avengers 3).