It's not known exactly who the Sox would send, but reports indicate that the deal would be centered around top organizational pitching prospect Casey Kelley. Names like Ryan Kalish, Anthony Rizzo, Raymond Fuentes and others have been tossed around as well.
It's important to note that ESPN is reporting that the Padres would not receive any major league talent in the deal. This means that the Sox will be hanging on to outfielder Jacoby Ellsbury, who has been embroiled in trade rumors ever since his injury-filled 2010 season.
No further word yet on the progress of a new extension for Gonzalez; he's a free agent after the 2011 season and the Sox would likely extend him before the season starts.
Gonzalez has been the apple of GM Theo Epstein's eye for the last few years, and now it seems official. A-Gon is coming to Boston.