In addition to the 2015 Aprilia RSV4 RR that was spied by our friends at Oliepeil, the Dutch sleuths have caught a glimpse of the 2015 Aprilia RSV4 RF. What does the “RF” mean, and how is it different from the “RR” model? We really have no idea, to be honest. Leave your best guess in the comments section, and we will give five A&R bonus points to whomever is closest.