I'm starting this right now because the UFC 2009: Undisputed info is starting to pop up and this will tidy up the section by sticking everything in one thread.
If you want to stick info from another thread in this thread, you better do it soon because all other threads on UFC 2009 will be closed/removed within 24 hours.
I'll continually update this post as new shit is rapidly released to the public.
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UFC 2009: Undisputed
Screen Shots:

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Confirmed In-Game Characters:
Playable:
Quinton "RAMPAGE" Jackson
Forrest Griffin
Chuck "The Iceman" Liddell
Anderson "The Spider" Silva
"The Prodigy" BJ Penn
Non-Playable:
Mike Goldberg
Joe Rogan
Mario Yamasaki
Juanito Ibarra
Jacob "Stitch" Duran
Arianny Celeste
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General Features:
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AUTHENTIC UFC PERSONALITIES -- Explore a deep roster of more than 80 top names in UFC competition across five weight classes and enter the Octagon surrounded by the sport’s popular commentators, announcers, referees, trainers, Octagon girls and more.
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PHOTO REALISTIC MODELS AND EFFECTS -- Experience the world of UFC as it appears on television with photorealistic fighters who breathe, sweat and move like their real-life counterparts. Players will also view amazing ripple effects across the faces and bodies of their fighters from the impact of devastating punches and kicks.
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CONSTANT CONTROL -- Gain the upper hand in matchups with a brand new fighting game engine designed specifically for next generation systems. Emphasis on innovative, responsive and easy-to-play controls will give players unparalleled command of their fighters in the Octagon.
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FIGHTING DISCIPLINES -- Take down opponents and get the submission with a variety of mixed martial arts disciplines, including Judo, Muay Thai, Wrestling, Kickboxing, Boxing, and Brazilian Jiu-Jitsu.
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CREATE-A-FIGHTER -- Jump start the career of a future champion by customizing your fighter’s physical appearance, learning new fighting techniques to use in the Octagon and managing the training process through attributes such as strength and cardiovascular health.
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CAREER MODE -- Develop attributes, perfect moves and fight for entry into the UFC Hall of Fame through a series of dynamic storylines that build friendships and instigate intense rivalries.
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More to come as it's released. Stay tuned.