Indie studio inkle announces a September 29th Windows and OS X release date for 80 Days, their adventure game loosely based on Jules Verne's Around the World in 80 Days. This is already available for mobiles, but the desktop versions will add new content. There are details on the 80 Days website and here's word:

Set in an alternate-history version of Jules Verne's Victorian era, 80 Days sends players on a real-time race around an ever-changing, often surprising steampunk world. Playing as Phileas Fogg's French valet Passepartout, use strategy and cunning to help your employer win a hefty bet before the clock runs out. Choose your route, manage your finances, interact with hundreds of diverse characters, see the world, and lose yourself in a massive, branching adventure as you attempt to circumnavigate the globe in 80 days -- or faster! Brand new content debuting in the PC / Mac version will bring 80 Days' word count to almost 750,000 (more than the first five Harry Potter novels combined!), with nearly 200 cities to visit.