The complaint, filed in federal district court in Connecticut on August 4, is here: 273548545-MGM-v-Malloy Complaint.
The state law, signed by the Governor on June 19, 2015, is here.
From the complaint:
MGM seeks to have the Act declared invalid and enjoined on two principle bases:
a. The Act violates the Equal Protection Clause because it is a race-based set-aside in favor of the two Preferred Tribes at the expense of all other tribes, races, and entities; and
b. The Act violates the dormant Commerce Clause because it discriminates on its face in favor of the two in-state Preferred Tribes at the expense of out-of-state competitors, all of whom are barred from attempting to develop a casino gaming facility in Connecticut.