You would probably get the latest and greatest info by just walking to the SWOS building and ask the instructors or students. You know how close it is to you right...within spitting distance.
The only gouge I could offer, being I'm not a SWO, is that my friend (YG 03) went to SWOS after being attached to his ship for 14 months. If there would have been a class-up date earlier for him that would fit in with his command's schedule, he wouldn't have waited 14 months to go.
Before that, I know of people (YG 01) who went to SWOS right after college and then to their ship. When they changed the process, I do not know, but it was somewhere between those year groups.