The new recall for MY2013 models do not include a software update. Only the oil is changed from synthetic to mineral.
If you did receive a software update it would probebly be the 37g7 update which is generally applied across all models. New models "should" have it pre applied but apparently VW sucks when it comes to updating production runs.
I recently got the 35c1 recall which apparently includes new Mech, Oil and a software update.
Now I didn't get the update (it's not stated on the invoice) but this could be becuase I got the 37g7 update way before.
I would like to hear from other people who have done this recall and who did/didn't get the update. I'm not sure if the dealer I went to is incompetent or it genuinely didn't need it.