Kind of interesting;
http://www.starwarsnewsnet.com/2015/11/empire-reveals-the-name-of-a-new-planet-from-star-wars-the-force-awakens.html

"The guys from StarWars-Union.de have a very interesting theory on Starkiller base and its location. They compared the new map with an old one and discovered that the planets Ord Mantell and Rakata Prime fit directly with the same planets from the new star map. And Starkiller base is located where previously another ice planet stood – Ilum!"

Also, Spielberg have apparently already seen TFA three times!
http://www.starwarsnewsnet.com/2015/11/daisy-ridley-to-glamour-magazine-steven-spielberg-has-seen-the-force-awakens-3-times.html