According to the UFC's Twitter page:
Heath Herring is out of UFC 99 in Germany due to injury. His replacement will be named tomorrow on UFC.COM.
Herring was due to face top heavyweight prospect Cain Velasquez in the co-main event of the evening.
Edited by Charles Walker
UFC.com just announced the replacement will be none other than...Cheick Kongo
When Heath Herring was forced to withdraw from his UFC 99 bout against Cain Velasquez, the search immediately went out for a replacement. Well, the UFC didn’t have to look very far, as highly-regarded contender Cheick Kongo has stepped up to face the unbeaten Velasquez on the main card of the June 13th bout in Cologne, Germany.
Kongo is currently riding a three fight winning streak that includes TKOs of Dan Evensen, Mostapha Al-Turk, and Antoni Hardonk. In Velasquez (5-0), he faces one of the division’s brightest young stars in what promises to be one of the most exciting fights on the stacked UFC 99 card, which is headlined by the bout between Rich Franklin and Wanderlei Silva.
Wow, I think this will still be a good fight, although I think Herring would be a little tougher for Cain, I think Cain can take Kongo down and do damage, but it'll be interesting to see if Kongo's takedown defense is really up to par for this one. Glad they got a solid replacement.