Apparently the next generation of Microsoft PDA/cell phone back in 2003 had been dubbed the "Future Phone".
All it seems like is a cell phone with advanced features like those found on a PDA... I may not be the most tech-savvy consumer out there, but I thought that phones like this were already out there even back then. Anyhow, it was basically a catchy jingle name for something that was going to come out anyways. So this moniker is likely to be reused as needed for the "next generation" of phones that anyone comes out with.
Here I was all hyped up when I came across this empty node, I thought that there was really something neat out there. Serves me right.