Having had the first F-n-F and the newer, they were made with the same spec blank although you are right on the older not being equal length. As far as the Superfine, that is just a name for what they are. The F-n-F being a superfine as the one ounce, full flex. However then they introduced a 4 pc four weight and they called it the TROUT BUM. They could call the new one the F-n-F but I will bet that they don't with the intro of the two extra pieces. The F-n-F was designed after the boo and a good choice.
I am an Orvis gal all the way and have been for several years.
It's like the Trident TL, then the TLS (same blank with less expensive hardware and now the TLS Power Matrix. I believe that if they do carry on with the Far and Fine name they will add something to it to make it distinctive
I guess we will find out real soon, cause it is on it's way.

One more note. A couple of years ago when the power matrix was introduced it was called TLS Pro Guide, then about a year later changed to Power Matrix, same with the mid arbor.