Now, before any gets super excited or wants to start a riot out of pure fury, keep in mind the key word here is: REPORTEDLY. There has been no word (that I know of anyway) from Lionsgate. Until they release an official statement, this is only a rumor, really.
27-year-old "Sucker Punch" actress Jena Malone has reportedly been offered the role of Johanna Mason in The Hunger Games: Catching Fire. In case you've forgotten, Johanna Mason is a snarky victor from District 7, a previous winner of the Hunger Games. She won by pretending to act weak when in reality she was sly and cunning. Jena Malone's imdb page is here, if you want to check out the projects she has been in.
Mia Wasikowska and Zoe Aggeliki are/were also reportedly up for the role.