'Captain America: The Winter Soldier' Now Filming

The sequel to 2011's Captain America: The First Avenger is now underway.  Captain America: The Winter Soldier will pick up after the events of The Avengers, with Steve Rogers adjusting to life in modern times.

Here's a snippet from the official Marvel announcement:
“Captain America: The Winter Soldier” will pick-up where “Marvel’s The Avengers” left off, as Steve Rogers struggles to embrace his role in the modern world and teams up with Natasha Romanoff, a.k.a. Black Widow, to battle a powerful yet shadowy enemy in present-day Washington, D.C.
Source: Marvel