I think autodesk will not offer a crossupdate to max when they don't want to wast energy anymore in promoting the same product in two different ways or having two devteams.
Maybe there will be one more viz update when they put the missing radiosityfeatures of max5 to viz4, but at the moment i see my money invested in a dead horse.
Lightscape is still working fine. Try the
Postsparkasse scene with viz and you will know what i mean.