Though there's nothing that Carolina has specified, or that has been rumored, look for the team to at least talk hard with former Chargers CB Antoine Cason and NT Antonio Garay.
Cason, a free agent, isn't bulletproof - his QB rating was over 100 last year when being thrown at. But he played well over his head in 2010 for Ron Rivera, and continued it after Rivera left (but DBs coach Steve Wilks was still there). For full disclosure, Rivera did bench Cason in 2009 after a difficult stint in the slot; Cason is an outside corner.
Garay was a find by the Chargers in 2009, Ron Rivera's first full year as coordinator in San Diego, and had a massive 2010, stout against the run and under-rated rushing. Re-signed in 2012, he struggled with a move to LDE and only played in 8 games; still, he can play and the injury wasn't a major concern.
That would cover some needs short term, long enough to get some youth in there behind them. I wouldn't complain much about it, anyway.