David Shafer traded for Kirk Saarloos

David Shafer and a PTBNL were traded today for Kirk Saarloos and a PTBNL.
Shafer went 1-2 with a 2.36 ERA and 26 saves for AA Chattanooga last season. Best of luck to him in his new organization.
Where does Sarloos fit into the Reds plans? Will he come from the bullpen or will he start?