I would expect the R8s to be re-issued by someone like AutoArt or Minichamps a few years down the line, when the Maisto license runs out, seeing as the cars are very significant and the likes of the Gulf and Champion cars were never released by Maisto.
BTW all of the Le mans winners from the 80s and early 90s will be released soon from Minichamps, Exoto and Autoart.
Heres the Mazda 787B
http://rotarynews.com/node/view/471