It appears that for his debut collection that he is referencing classic Dior with the ultra feminine cinched waist and contrasting fullness. Although noticeably timeless Christian Dior style, Raf Simons brings definitely his own modern take to the iconographic style lines, with his use of fabric and a breathe of masculinity. What I can really appreciate about the collection, being someone of an minimalist/ androgynous inclined dresser, is the beautiful cohesion of both femininity and masculinity. In my humble opinion even from this one collection, I can assert that I much prefer Raf Simons at Dior then John Galliano.
Some of my favorite looks from Raf Simons for Christina Dior Fall Couture 2012 from Vogue.com
Here are some great articles on commentary on Raf Simons collection as well as his history.
http://www.vogue.com/collections/fall-2012-couture/christian-dior/review/#
http://www.vogue.com/voguepedia/Raf_Simons