Yeah Graphene is planned, was just lacking a way to make it and use it for most of the time.
Wafers are already in GT6, so what are you talking about? Sure it’s named “Silicon Plates”, but that’s what it is meant to represent.
Natural Gas is the Stuff from Per Fabrica Ad Astra (PFAA), but I might add it later myself too.
Methane-Ice is in my Material List, I might add that too somewhen.