
Katniss Everdeen: will be played by Jennifer Lawrence.
Most of you probably saw her in "Winter's Bone" (an adaptation of Daniel Woodrell's 2006 novel of the same name)
Gale Hawthorn: will be played by Liam Hensworth.
You might know him from The Last Song, Knowing, and Triangle.

Peeta Mellark: will be played by Josh Hutcherson.
His most known roles include Journey to the Center of the Earth and Bridge to Terabithia.

Effie Trinket: will be played by Elizabeth Banks.
Her recent works include Spiderman, Zack and Miri Make A Porno, and 40-Year Old Virgin.

Primrose Everdeen: will be played by Willow Shields who is debuting young actress!

Rue: will be played by another debuting young actress, Amandla Stenberg.

Thresh: played by Dayo Okaniyi, who's yet another debuting actor in the movie world!
Glimmer: will be played by Leven Rambin. She's played in quite a few TV shows, including All My Children, The Sarah Connor Chronicles, One Tree Hill, and Grey's Anatomy just to name a few.
That's all we know for now.
Personally I love the choice of actress for the role of Katniss. I saw Winter's Bone and although the movie itself didn't blow my mind, I really loved Jennifer and how she played! She was brilliant! I think she will make a wonderful Katniss :)
Peta? Meh, could have been better. I somehow can not imagine Josh in this role. Can you? I mean, he has this amazing sensitivity painted all over his face.. which fits the role perfectly, but other than that he just looks like a .. kid!
Gale! I didn't have a chance to see any of Liam's movies yet, so I don't really know what kind of actor he is, but judging my his physical appearance, this was definitely a good choice! He does look like Jen's cousin, doesn't he? And most certainly he looks like a skilled hunter! Nice, nice! :D
I really like the choice of actresses for Prim and Rue, both girls look just like I imagined the characters to be! And it's really nice to see some new faces for once!
Effie? Oh my, I dunno.. I saw all the movies with Elizabeth Banks and I do love her as a comedy actress, but I'm not quite sure if this was the right choice for the role of Effie.
What do you guys think about the cast?