Enzo Amore and Big Cass drew some big attention to themselves when they raided the ring during the ROH/NJPW G1 Supercard. This was a big surprise and very convenient timing for a run-in because Bret Hart was just attacked at the WWE Hall Of Fame so the IWC was getting a lot of invasion angles.
Dave Meltzer confirmed on Wrestling Observer Radio that neither Enzo or Cass have actually signed ROH contracts. They are expected to feud with the Briscoes, but nothing is set in stone.
On top of that, the former WWE Superstars are not scheduled to be at ROH’s television tapings either. That doesn’t mean that they won’t just show up because few people knew about their intentions at Madison Square Garden during the G1 Supershow.