1. Will passengers ever be added
Unlikely for this version. The biggest obstacle seems to be the lack of memory in FSX, we are already close to not be able to use a scenery because of OOMs, and visible passengers won't improve that.
I'd say it's likely they'll appear in P3D only, when there will be a 64 bit version, eventually. Which we think it will happen, if the sim would have any chance of future growth. And, with P3D there are way more rendering options and more powerful simobject capabilities, that would make the thing more feasible.
2. Second release that includes loading for GA
Possibly, as an expansion dedicated to GA.
3. Random load sheets based on ground crew interaction
Possibly, as an expansion dedicated to Cargo operations.