One of the items discussed at the OPAG meeting in Boulder was the proposed New Horizons 2 mission. This mission would use a clone of the New Horizons spacecraft, a mission is preparation for a Pluto/Charon flyby as well as a pass by a smaller Kuiper Belt object. New Horizons 2, if launched in 2008 or 2009, would flyby Jupiter and Uranus on its way to a large KBO. The Uranus aspect is time critical given its setting during the Uranian equinox. This would provide excellent global coverage of Uranus' mid-sized icy satellites (like the oddity Miranda), as well as study Uranus' magnetosphere and atmosphere at this juncture.
For more in-depth information on this proposal, check out a power point file
over at the New Horizons website.
From my understanding, the reaction to the proposal was mixed. The issue came down to the lack of ability to propose a New Frontiers mission outside of the 5 recommendations in the Decadal Survey. This certainly needs to be changed if new discoveries or targets of opportunity (like a flyby of Uranus at equinox) are found.