When Did Sex Offenders Have to Register?

This morning, in United States v. Cain, the U.S. Court of Appeals for the Sixth Circuit split over whether a sex offender convicted prior to the enactment of the federal Sexual Offenders Registration and Notification Act (SORNA) was required to update his sex offender registration before the  Attorney General adopted regulations implementing the law’s registration requirement and specifying the applicaiton of the requirment to pre-SORNA offenses.  Judge Rogers, joined by Judge Guy, held for the defendant, concluding there was no obligation to register prior to the adoption of the regulations.  Judge Griffin dissented.

The law at issue was part of the Adam Walsh Child Protection and Safety Act of 2006.  The Supreme Court already has one case this term concerning this law (United States v. Comstock).  Could this make for a second?