So far it looks like the pen has five "locks" in Ohlendorf, Soriano, Storen, Clippard and Stammen. Rotation looks set with Strasburg, Gio, JZimm, Fister and Detwiler.
I'm saying Boone Logan and either Cedeno or somebody like J.P. Howell would round the pen out fine. Maybe there is a taker for Soriano out there somewhere...