It's always great when a major sex symbol returns to her role thirty-some years later to remind us all that we won't be young forever. On that note: Carrie Fisher has confirmed she will return as Princess Leia for Star Wars Episode VII!
In an interview, Palm Beach Illustrated asked Fisher if she could confirm that she will be a part of Episode VII, to which Fisher responded simply, "Yes." Fisher has confirmed her involvement then taken it back in the past, so perhaps this should be taken with a small grain of salt.
It has been assumed for a while that the new installment will take place a few decades after the events of Return of the Jedi, with Luke, Leia, and Han all returning. Deals are likely currently being worked out for Mark Hamill and Harrison Ford, who recently joined the cast of Anchorman 2.