There is a short article on the new Velvia 100 Professional in the October 2005 issue of Shutterbug for those who are interested. Nothing new in the article really, although the author says he has gotten good results rating this at 125.
One quote from the article that made me smile: "Take a very high megapixel camera, boost the color saturation and sharpening, with the concomitant edge effects, and then remove any and all noise, and you have a taste of what this film offers." Emphasis mine.
Has anyone tried this at 125 yet? I've pretty well stuck with shooting it at 100 and haven't had the opportunity to experiment with it much.