It's sort of right there in the name. It's called Cosmic Encounter: Duel, so you'd figure that dueling would take up a large portion of the game. Well, Fantasy Flight is here to show off just how much. Have yourselves a look-see.
From the article:
You’re just another budding alien civilization in the incomprehensibly ever-expanding multiverse, and the news comes without warning: the Cosmic Citizenship Council has announced that it will allow two new alien species to join its ranks. But, lacking two copies of the filing form, only a single species can join! You must prove your right to become a Certified Civilization.
Cosmic Encounter Duel takes the frantic back-and-forth action, zany powers, and colorful sci-fi conflict of Cosmic Encounter and distills the essential experience into a game for just two players. Over the course of the game, you and your opponent will duel for control of planets, and first player to lay claim to five planets is the victor!
As you might expect from the title, the duels between you and your opponent take prime position in Cosmic Encounter Duel, and with today’s preview, we’ll take a closer look at the twists and turns you’ll face in every duel!