MAN-LPA was launched as winter season only, it's due to lack of volume on hotel rooms in the summer, as it's very popular with Germans in particular in the summer who take up the lions share of the rooms.
MAN-AGA probably suits the winter sun method more, as Agadir drops off a little in the summer as the Med areas are more popular. MAN has Air Arabia Maroc and Thomson in the summer so ample capacity.
It's no different to Lyon and Turin also being winter only, serve the routes at their peak flows.
As for new routes, I have heard 3 mentioned, but we will just have to see what transpires.