In the Quarter Quell reaping of contestants for the Hunger Games in Panem, the chosen are all previous victors. Whereas in the first movie (or book) everyone chosen was anonymous at the time of the reaping, this scenario for The Hunger Games: Catching Fire is much more intense because everyone involved is famous for winning their own Hunger Games.
In this featurette from AMC Theaters we get a full list of those victors and from what district they hail:
Featurette: The Hunger Games: Catching Fire – The Anatomy of Panem – A Look at the Districts
The Hunger Games: Catching Fire, starring Jennifer Lawrence, Josh Hutcherson, Liam Hemsworth, Woody Harrelson, Donald Sutherland, Stanley Tucci, Philip Seymour Hoffman, Jena Malone and Elizabeth Banks, is slated to hit theaters on November 22nd, 2013.