You currently cannot play Diablo III on as many different platforms as you can play, say, Skyrim. But it looks like the number of available platforms will go up soon; Gamespot is reporting that anonymous sources indicate the title is indeed coming to the Nintendo Switch. Those sources have nothing to say on the topic of whether or not the game’s expansions will be included, but one can certainly assume that will be the case.
So why the silence after an earlier tease for exactly this? Well, it may be because Nintendo seems to prefer to remain tight-lipped about these ports until they’re closer to release, or it may be that the current testing is more about seeing if it’s doable than specifically making it happen. Or it could just be willful obtrusiveness, or the anonymous sources are wrong. You get to decide!