The Bears put together their ten man practice squad today. Players waived from the 53-man roster who haven't exhausted their practice squad eligibility could have been signed to the practice squad after 11 AM CT yesterday. This includes players that weren't on the Bears' training camp roster.
Frey was the team's starting nickel back last year after Kelvin Hayden went down with an injury. This year Tim Jennings will move to nickel in those packages, and Demontre Hurst appears to be his direct backup.
Frey's inclusion on the practice squad takes advantage of a couple of new rules in effect for the next couple of years. First are the addition of two new slots to the practice squad, and two of those ten spots can be used on players with no more than two accrued years of free-agency. A player also doesn't accrue a practice squad season until he's on the squad for six games, as opposed to three in prior years.
Without the "no-more-than-two" exception, a player can be eligible for the practice squad if he doesn't have more than eight games on the active 46-man roster in each of his first couple seasons.
The rest of the practice squad rules are still in effect, and can be found over here.