As reported here by Susan Slusser the PTBNL is Sean Gallagher.

"GALLAGHER TO PADRES: The player to be named in the Scott Hairston deal with the Padres will be right-hander Sean Gallagher, two sources confirmed to The Chronicle. Gallagher (knee) is on the disabled list at Triple-A Sacramento and is not eligible to be sent to San Diego until he comes off the DL."

"Gallagher, obtained last July in the Rich Harden trade with the Cubs, is 3-5 with a 6.34 ERA in 17 games, 13 starts, with Oakland. He had a 1.74 ERA in five starts (202/3innings) with the River Cats this year."

Not sure how I like this trade now. I liked Gallagher a lot. We shall see.