There was some discussion of this at the Known Direction panel a few days ago (which included Tonya, Thursty and other official types). It sounded like the scenarios will be released on GenCon Thursday. Supposedly, IIRC, there are: one evergreen pre-gen scenario, a quest type scenario, and three other scenarios being released at/around that time.
Also, IIRC, Tonya and company stated the current plan is to release one scenario a month at first to gauge interest in SFS. It sounds like they're possibly going to try to figure out a way to play the AP for SFS credit as well.