I think I may skip ordering the UFC 52 and order this the following week.
Not sure whos exactly fighting who but these are a list of the follwing participants. Source, mmaweekly.com

Tournament Participants:

Wanderlei Silva

Antonio Rogerio Nogueira

Quinton “Rampage” Jackson

Igor Vovchanchyn

Kazushi Sakuraba

Dan Henderson

Mauricio “Shogun” Rua

Yuki Kondo

Hidehiko Yoshida

Kazuhiro Nakamura

Alistair Overeem

Kevin Randleman

Vitor Belfort