While i was browsing the superheroes section of brickipedia i stumbled upon these pics:
They are not much but they give us our first full look at the aliens,even if it is in lego.
Marvel Studios presents in association with Paramount Pictures “Marvel’s The Avengers”--the super hero team up of a lifetime, featuring iconic Marvel super heroes Iron Man, the Incredible Hulk, Thor, Captain America, Hawkeye and Black Widow. When an unexpected enemy emerges that threatens global safety and security, Nick Fury, Director of the international peacekeeping agency known as S.H.I.E.L.D., finds himself in need of a team to pull the world back from the brink of disaster. Spanning the globe, a daring recruitment effort begins.
Starring Robert Downey, Jr., Chris Evans, Mark Ruffalo, Chris Hemsworth, Scarlett Johansson, Jeremy Renner and Samuel L. Jackson, & directed by Joss Whedon from a screenplay by Joss Whedon, “Marvel’s The Avengers” is based on the ever-popular Marvel comic book series “The Avengers,” first published in 1963 and a comics institution ever since. Prepare yourself for an exciting event movie, packed with action and spectacular special effects, when “Marvel’s The Avengers” assemble on May 4, 2012. The film is distributed by Walt Disney Studios Motion Pictures.