Here:
An Act Establishing Expanded Gaming in the Commonwealth
State of Massachusetts Brief (and Supporting Amicus) in KG Urban v. Patrick (1st Circuit)
Opening Brief in KG Urban v. Patrick (Mass. State Gaming Case)
Here:
KG Urban Motion to Expedite CA1 Appeal
Mass Response to Motion to Expedite
Lower court materials are here and here and here.
News coverage here, h/t Pechanga.