NOT on MTV they are not. Real World, yes, but all the other new shows like Silent Library, Preggo at 16, Teen Cribs, just about ALL the other brand new episodes is in SD. At least MTV always airs in the original aspect ratio. So, one good thing for them.
It is particularly sad since they just finished airing the brand new series Conspiracy Theory with Jesse Ventura in SD stretcho. There are still far too many shows being produced at this very moment in SD.