SFS has an audition page wherein they list upcoming auditions and sometimes the repertory required for the auditons. I checked it out today in connection with CK Dexter Haven's mention of goings-on in the percussion section, and I found the following:
Principal Second Violin (November, 2013)
Associate Principal Trumpet (Winter, 2014)
Principal Oboe (February, 2014)
Principal second violin, eh? That's a chair currently held by Dan Nobuhiko Smiley.
Justin Emerich has been Acting Associate Principal Trumpet since Glenn Fischthall's retirement. I cannot remember whether there has already been one round of auditions for replacing Fischthall.
We've got a scheduled Principal Oboe audition, but not Associate Principal, but there hasn't been an announcement yet about whether Jonathan Fischer is staying in SF or going to Houston permanently.