f is Vita version F is PS3 version.
PS3 version of Project Diva got the capital letter cause of the DLC that vita version has.
So Project Diva F(PS3)= Project Diva f(Vita) + DLC
"Start your day with Cup Noodles Breakfast! This limited time flavor blends ramen with your favorite breakfast flavors, including pancakes, maple syrup, sausage, and eggs."