From the Rise of Flight blog, we're told the game will be played over the entire Western Front of the first World War - more than 125,000 square kilometers of playable territory. In addition to striving for super realistic physics and period aircraft, players will get career singleplayer mode, plus a networked mode. You can fly for any of the Central Powers or Triple Entente aviation services. (Germany or Austria, or France, Great Britain, Italy, Russia or the U.S.)
The aviation gameplay they've released so far looks appealing; some of the ground elements are a little stiff and rudimentary, but again, this is a flight simulator. For a type of game that had such strong appeal, and has largely been dormant for 10 years, Rise of Flight is at least noteworthy in that someone's trying to get back in and do it right.
Rise of Flight [Official site]