AP 7 is the only full working mission at the moment.
Work is being done to fix any bugs or errors in AP 7 found after release (along with some improvements here and there) I believe.
Work is also being done on AP 8, but this will most likely take awhile. Major work to be done includes separating the LV into each stage. From what I understand, it's basically one vehicle. However, Orbiter 2016 will allow them to have separate stages that are connected, much like IRL.
Work is also being done on the LM. But there are major systems that either aren't working, or aren't "hooked up". So there's not a lot to work with, LM-wise.
I suggest checking out the NASSP forum on the Meadeville Spacecenter Forums. You'll be able to read about all plans and development progress.
Sent from my iPhone using Tapatalk