Is this the Pluto-Express?
It's a successor to the Pluto Express; the window for that mission closed a couple of years ago I think. The idea was (as you probably know) to get to Pluto while its probable atmosphere was still gaseous. As Pluto heads further from the Sun, it will freeze solid.
Pluto Mission Takes Aim at Last Unvisited Planet
National Geographic | 2.15.05
Posted on 02/15/2005 10:38:28 PM PST by ambrose
http://www.freerepublic.com/focus/f-news/1344217/posts