Cross-referencing the latest minor-league spring roster (dated March 25) with the one from the start of camp (dated March 12, link and link), there are a few changes, mostly from players being demoted from major-league camp.
Pitchers -- Robert Della Grotta, Jino Gonzalez, Matt Long, Wilton Noel
Outfielder -- Quinn Stewart
Infielder -- Chase Fontaine
Pitchers -- Winston Abreu, Jason Childers, Randol Choate, Wade Davis, Dewon Day, Julio DePaula, Carlos Hernandez, Jake McGee, Eduardo Morlan, Elvin Perez, Mitch Talbot, Dale Thayer
Catcher -- Matt Spring
Infielders -- Tim Beckham, Chris Nowak
Pitcher Richard De Los Santos still isn't listed.