They let four security force members (police and military) go free to the Red Cross (ICRC) Sunday local time, and reports are that two political hostages will be released today.
The big question on all this is "Why now?", and that looks to be at least in part because of a move by the FARC to regain the ability to negotiate through their 'useful idiots' such as Colombian Liberal Party Senator Piedad Córdoba...
...think of Rev. Jesse Jackson in a skirt, and you've got the picture on her.
Errata: corrected the date of the first release. Thanks, Kate!