Thanks for the replies.. That's what I thought it might be for but I'm unable to find a light online to purchase for that spot. What would it connect to as a power source if there was a light available?
Also for anyone interested in a footwell illumination kit for our 2012-2013 impreza models I've come across this:
It's listed under the 2013 accessory installation guide, but I don't see why it wouldn't work on a 2012 model as well. It's about $120-130 online from what I have found.