Utopia

Utopia is the winning entry from a recent Angry Birds Competition create planet names as related to Angry Birds Space. Rovio announced 1 winner and 4 runner-ups, all of whom won Space Boxes. The winner was Hayyie, who pitched the name "Utopia."

Contrary to popular belief, Rovio has not yet publically committed to using "Utopia" for any forthcoming planet. Multiple times via their Twitter account, Rovio has remarked: Plus their Facebook account, in which rovio remarked: It's a secret:) you'll find it soon, promise.
 * No news on the upcoming planet just yet... sorry! :D Tweet 1
 * Haven't announced anything regarding that yet! Tweet 2

On May 30, 2012 The Angry Birds Facebook page posted a picture similar to Hayyie's, saying: "Just a dream"? This shows that Utopia will be the next planet.