Walt Disney Animation Studios presents "Frozen," a stunning big-screen comedy adventure. Fearless optimist Anna sets off on an epic journey—teaming up with rugged mountain man Kristoff and his loyal reindeer Sven—to find her sister Elsa, whose icy powers have trapped the kingdom of Arendelle in eternal winter. Encountering Everest-like conditions, mystical trolls and a hilarious snowman named Olaf, Anna and Kristoff battle the elements in a race to save the kingdom.
According to this website, both Anna and Elsa will be added to the princess line? Also on the left, a glimpse at Elsa wich looks like a concept art and pretty much confirms the previously leaked/fake designs… (via)