Jamie Ramsey announced the transaction. It's not at all surprising that Costanzo got sent down after a 100-something OPS in 21 PAs, but the choice of Kris Negron is a little puzzling. He has a .214/.274/.334 line in 733 AAA PAs, and an ever-so-slightly-less-barfy .212/.291/.336 this season.
Negron is up for his position versatility - he's played everwhere on the field except P, C and 1B this season - and his ability to play CF may have had something to do with the choice. Drew Stubbs appears to be day-to-day.
Everyone who ever made the "Negron, please" joke that made us all uncomfortable is now getting what you wished for and/or a punishment.
Negron became a member of the Reds organization in August 2009, coming over from Boston in the Alex Gonzalez trade. With Sea Bass on the shelf, it looks like we won that trade again, after having lost it for a while. He'll be making his MLB debut.