I eagerly await a map. A map is incredibly important for a fantasy world such as Runeterra. I would be happy even if they release a map on a napkin as you said, as well.
I believe I have information about this issue, however I can't remember in which Jaredan's comment I've read this: They want to release a map, however, they can't release it, unless they plan out every consequence of geographical positions of important locations - they say they want the action to govern the position of locations. Otherwise, as they say, the action will be "restricted" by a map that has been randomly made. They don't want to get an amazing idea for an event or something, then suddenly discover that they can't make it because the map doesn't allow that.
However, I find this to be a bit silly. Then a map will never be made, because they'll always need to make an infinite number of events before they could make a map.
Another thing came to my mind, and I think this is one of the biggest problems the Retcon has made: without the IoW, Runeterra is just another generic fantasy land. There's nothing characteristic about it; for example, Kindred could as well be from another fantasy world. Runeterra has no core identity, and that can't be made by stitching together some random stories that might be well writen, but have no meaning one in relation to the other.