I'm getting a HP4 and it has Brembo floating rotors, so I won't have to wonder anymore if I have them or not. My understanding of a "floating" rotor, i.e. one on a hat with "buttons" was to allow some left to right movement of the disc, thereby promoting alignment with the fixed calipers on most motorcycles and to allow better radial expansion of the disc to help dissipate heat buildup.
The manner in which the standard rotors on the S1kRR "float" appears to me to be in a forward/rearward manner. At low speeds this sometimes produces a clicking noise, reminiscent of loose steering head bearings. While these may be floating rotors, they do not, in my estimation assist in the benefits of floating rotors as outlined above.
Can't wait to try the HP4