Star Wars: The Old Republic. There's a war taking place, which is more or less a constant event in the franchise. After several years of the Republic falling back and regrouping, it's finally pushing ahead. Unfortunately for both the Empire and the Republic, fighting a war for that long means using up a lot of resources... resources that can be found on the neutral planet of Makeb. The neutral planet that the Hutt Cartel has just invaded in a bid to become a galactic superpower.
The latest video from the SWTOR development team shares more story setup and design previews from the planet Makeb, centerpiece of the upcoming expansion Rise of the Hutt Cartel. If you're looking forward to cascading waterfalls or orbital elevators, you'll want to take a look at the full video just past the break, but if you're just in it for the story, there are a few more tantalizing glimpses in there as well.
[Update: BioWare has also just released a dev blog with some gorgeous concept art for the planet.]