I... honestly have no clue. But could this be a spiritual successor to Dark Avengers? It's hard to say, as Marvel offered no other details outside of a May 2010 launch window. Even the roster "reveal" is blacked out. You can see the images below. At first glance I want to say one of them is Venom, but that almost seems too obvious. The following are the possibilities of the silhouetted Secret Avengers.
Who are they? Take your best shot and let's see if we got it right by May this year!
Possibilities: Captain America, Ronin, USAgent, Professor Xavier, Patriot, Iron Patriot, Nick Fury, Luke Cage, Ares.
Possibilities: Beast, Venom, Anti-Venom, Ant-Man, Black Panther, Dark Beast, Gorilla Man, Scarlet Spider, Lizard, Tigra, Daredevil, Toxin, Constrictor.
Possibilities: Iron Man, War Machine, Crimson Dynamo, Deathlok, Gauntlet, Bishop, Frankencastle, American Son.
Possibilities: Sentry, Moon Knight, Taskmaster, Shroud, Mephisto, Cloak, Brother Voodoo, The Hood, Beta Ray Bill, Dr Strange.
Possibilities: Valkyrie, Scarlet Witch, Storm, Enchantress, Lady Sif, Polaris, Songbird, Emma Frost, Jessica Jones, Meggan, Spiderwoman.