Thomas, who lost in his UFC appearances to Ben Saunders and Matt Brown, will face 2008 Olympic wrestler Ben Askren as part of Bellator's welterweight tournament.
Curran, who won his last two fights for Strikeforce and XFO, will face Joe Doherty.
Herrig, a winner on the Oxygen's Fight Girls show, will meet Catia Vitoria in a women's bout.
In featherweight tournament opening bouts, Wilson Reis will fight Shad Lierley and Patricio Pitbull will meet William Romero.
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