In the wake of Aaron Berry's release the Lions added two corners: former Cardinal Justin Miller and former Jaguar Drew Coleman.
Miller is likely seen as purely a special teams guy who could push Logan for the return job. He probably won't end up on the 53 man roster.
Coleman, however, was solid in coverage last year with the Jaguars, especially in the slot. He will be in direct competition with former Indianapolis Colt Jacob Lacey and rookie Bill Bentley for the starting position across from Houston. I have to imagine Lacey is the front runner as of right now having starting experience and having already gone through OTA's, but this still be an interesting camp battle.
Coleman played 514 snaps (for comparison Berry played 478) for Jacksonville last season appearing in all 16 of their games and starting four. He caught two interceptions, defended nine passes, forced four fumbles, recorded 46 tackles (all those stats according to ESPN) and allowed two touchdowns (according to ProFootballFocus.com).
At the very least Coleman will provide quality depth for the Lions. His upside is limited coming into his age 29 campaign, but will be a welcome veteran presence in a secondary full of inexperience.