Straight from Mirko Cro Cop's blog on MMA-ID:

unfortunately I have some bad news– I won't be fighting at DREAM 5 at all. I was about to face Jerome LeBanner but he decided to fight in K1 against Schilt. Mighty Mo was the alternative and I accepted this challenge, but unfortunately Mighty Mo pulled off from the fight. I was ready to face Mo, but maybe this scenario wasn't that bad for me at all and I'll tell you why.

 He goes on to describe an ailing elbow and knee injury, and indicates that he's undergoing arthroscopic surgery tomorrow.  Mirko says he's still hopeful to make his return to DREAM for their show in September.