World of Warplanes is an upcoming free to play aerial combat MMO by developer and publisher Wargaming.net. For a while now, players have been battling for air supremacy in the closed beta where many of the planes and games features are already available.
Recently, Wargaming.net officially announced the date for open beta, which is set to begin on July 2nd 2013. The open beta will also introduce new features to the game, with new tools and tactical tips to guide the pilot through battle. For more info visit the game page.