On April 8, CA7 ruled that the case had been improperly removed from state court to federal court. The suit was brought against S&W, the gun shops that sold the guns that Crimo Jr. used, Crimo Jr., and Crimo Sr. The Crimos did not consent to the removal. Since all parties on S&W's side had to consent to the removal, the case should not have been removed.
Somewhat bizarrely (IMO) CA7 said that S&W removing the case to federal court was intended make the litigation "needlessly costly" to the mob. The case has been remanded back to district court to decide if S&W must reimburse the plaintiffs for the legal expenses associated with the improper removal. The case will then proceed back to state court for litigation. However, CA7 narrowed the case against S&W.
Against S&W, the mob had previously claimed (1) that the M&P-15 is a machine gun which is improperly advertised and (2) that S&W assisted in the mass shooting by providing Crimo Jr. with the weapon that he used. CA7 ruled that these are not separate legal claims, but that they are separate legal theories for why S&W is liable for the shooting. The only real claim against S&W is that it furnished Crimo Jr. with the weapon, whether the weapon was a machine gun or not.
I'm not sure how much the state court will appreciate the federal court deciding what the claim against S&W is.