It appears Pepsi Bottling Ventures will be releasing versions of Pepsi and Mountain Dew this spring made with sugar instead of HFCS. They'll be known as Pepsi Throwback and Mountain Dew Throwback. It's mentioned in this article: Bottler of the Year: Pepsi Bottling Ventures - Cover Story - Beverage Industry

and also in this message board post, four down, by ffmariners: Target: Four 12 packs of Mountain Dew for $5.51 + tax (YMMV, of course!) - Page 6 - SlickDeals.net Forums

although his information is somewhat dubious, as he includes Diet Pepsi and I don't believe Diet Pepsi would have ever contained sugar. Nonetheless, it appears to be real and coming soon :-).