Looks like the tail has been chopped ever so slightly. Also I notice the tank doesn't seem to have a J1772 inlet, so I guess F doesn't mean "fast charge."
It also obviously doesn't mean "fully faired" either. (This was my personal hope, so shucks.)
I guess at this point it must mean "fighter"?
Edit: On second thought, those sneaky rascals could have moved a J1772 plug to underneath the seat or something. Hard to tell if the SR/F has a split seat... maybe it does, and maybe that's why. Anyway I'm not holding my breath, I think the F means fighter from this point forward.