There probably won’t be much of an update until the New Horizons flyby in 2015. There is little observation of Pluto going on right now — we are too busy looking for Kuiper Belt objects in Pluto’s general direction that New Horizons can fly by after it passes Pluto.
I’m glad that mission got launched. Sure took a long time, and it got cancelled and reinstated a couple of times.
But anyway, both authors have used big scopes to make Pluto observations, but I haven’t found any further comment on this particular idea. I’m disappointed.