World of Warplanes. Wargaming.net says it has expanded the title's content to include "new warplanes, maps, and other features." The current beta build boasts 59 aircraft from Germany, the United States, and the U.S.S.R. There are four battle maps as well as new weaponry like bombs and rockets plus an in-game tutorial.
World of Warplanes is a lobby-based 15v15 arcade shooter featuring World War II-era aircraft. You can learn more about the game, as well as sign up for the closed beta, at the WoWP website.
[Source: Wargaming.net press release]