I have heard about the Harry Potter one, will try it out once it's released but after Pokemon Go's launch, I'm not going to be jumping on it like mad.
I actually found myself returning to Ingress recently, it has a lot more going for it in terms of actual gameplay.
Does Ingress still allow it's users to suggest new capture points / stops?
I can't recall what Ingress users call Gyms / PokeStops but I recall before Pokemon Go came out users can suggest / add new points at will. This feature I think was removed but only for Pokemon Go unless I am wrong.
In ingress they are called portals. They brought back submissions based on level.