Guardians of the Galaxy 2014 Confirmed Characters

THE BAD GUYS

Main Villain:
Ronan the Accuser 
http://en.wikipedia.org/wiki/Ronan_the_Accuser

Supporting Villain:
Thanos (who you may remember from the teaser at the end of the Avengers)
http://en.wikipedia.org/wiki/Thanos

Other villains:

Nebula
http://en.wikipedia.org/wiki/Nebula_(comics)
Played by Karen Gillain
http://en.wikipedia.org/wiki/Karen_Gillan

Korath
http://en.wikipedia.org/wiki/Korath
Unknown actor

THE GOOD GUYS

Rocket Racoon
http://en.wikipedia.org/wiki/Rocket_Raccoon
Might be played by Bradley Cooper
http://en.wikipedia.org/wiki/Bradley_Cooper

Groot
http://en.wikipedia.org/wiki/Groot
Played by Vin Diesel
http://en.wikipedia.org/wiki/Vin_diesel

Star Lord
http://en.wikipedia.org/wiki/Star_Lord
Played by Chris Pratt
http://en.wikipedia.org/wiki/Chris_pratt

Gamora
http://en.wikipedia.org/wiki/Gamora
Played by Zoe Saldana
http://en.wikipedia.org/wiki/Zoe_Saldana

Drax the Destoryer
http://en.wikipedia.org/wiki/Drax_the_Destroyer
Played by Dave Batista
http://en.wikipedia.org/wiki/Dave_Batista