From the official Shine Fights press release:
Shine Fight Promotions (Shine Fights) today announced the official signing of another main card bout for its upcoming "WORLDS COLLIDE: MAYORGA VS. THOMAS" event, as 2009 Abu Dhabi Combat Club 88-kilogram/Absolute division champion and Brazilian jiu-jitsu phenom Braulio Estima (0-0) will make his MMA debut against 2004 Olympic judo competitor Rick Hawn (6-0). The fight will be contested at a catchweight of 175 lbs.
"WORLDS COLLIDE" will emanate live at the Crown Coliseum in Fayetteville, North Carolina on May 15th, and will be broadcasted on pay-per-view.
This is shaping up to be a very interesting show. Seeing what happens when Mayorga comes in to MMA is certainly fascinating on it's own. But when you add in the debut of Estima, one of the stars of the 2009 ADCC, against an Olympic level judo player it becomes one of the most must-see "non-major promotion" events of the past few years.
SB Nation will have more coverage of the Worlds Collide event as details become available.