It's off unfortunately. It seems Hop never agreed to the fight, and it's obvious why: he'd get creamed. The link is in this thread
http://www.madjacksports.com/forum/showthread.php?t=319016
In that thread I say I like Katsidis, but there's an article on maxboxing that has comments from someone whose been watching Katsidis spar, apparently he's having trouble against southpaws, and they give Casamayor a good chance to win. A respectable guy I talk to is on Casamayor pretty big with a thorough write-up as well.
The best bet of the card was definitely Witter, unfortunately it's unavailable.