Although the 2013 RS5 page hasn’t gone live on the Audi USA website as of writing this post, the online configurator has.
Below is one that I configured in Sepang Blue, Black leather seats with Alcantara inserts, MMI navigation plus and the Matte Alu-Optic package. The list price comes out to $74,570, which is about $11,200 more than the list price of my 2011 S5.