Motor Row Sign?

Over the past couple of years, the city has spent a lot of money upgrading the street scape on Michigan Avenue south of Roosevelt. With these improvements have come some increases in pedestrian traffic, but it's still relatively minimal probably because a lot of the retail space hasn't filled in yet. We can only imagine that will change...

One of the improvements we noticed was a blank sign close to the corner of Michigan and Roosevelt (on the east of the street):
Although we don't know what this will be used for our guess is that it will highlight some of the historic areas in the neighborhood (ie - the historic motor row buildings along Michigan Avenue). Has anyone heard what this sign will be used for or when it will be used?