Obviously I have vague ideas but nothing is set in stone.

We kind of have two options;
1) Just go through a typical school years with all the normal trials and tribulations that people face. Few big issues dotted here and there, but nothing near the scale of the HP books or anything like that.
2) Have a significant plot where we face big, worldwide issues.

If you guys would prefer the latter, a Death Eater resurgence could be cool (predictable in some ways, but cool nonetheless), with our own twist on it. It would mean that if we eventually get to the point where the characters leave the school, there would be still plotpoints to follow. I have more ideas around this but as I said I'm flexible.