Originally reported by Jon Heyman of CBS Sports, the Giants will send outfielder Nate Schierholtz, catching prospect Tommy Joseph and low-level pitching prospect Seth Rosin to the Phillies in return for Pence. The Phillies will also include some salary relief in the deal, though the amount is not yet known.
Schierholtz, who had recently expressed interest in playing every day somewhere, is hitting .257/.327/.429 with five home runs in 77 games this season. The 21-year-old Joseph, LA's top catching prospect, was hitting .260/.313/.391 at the Dodgers' Double-A affiliate. Matt Gelb of the Philly Inquirer writes that Joseph is now the Phillies' "best position player prospect".
The third player in the deal, 23-year-old right-hander Seth Rosin, is a low level prospect but is believed to have a high upside. Rosin has a 4.37 ERA and 10.9 K/9 in 56 1/3 innings pitched at Single-A+ this season.
The Phillies have recalled Domonic Brown from Triple-A to take Pence's place in the line-up.