According to this new job-offer Diablo 4 will have an in-game shop. The launch of Diablo 3's auction house was a desaster and Diablo Immortal's microtransactions are not really popular.
More information.
More information.
I don't think there's much question it'll be that way again. That's just their model for these games. Repeat the same thing at higher difficulties, over and over.I don't care if it has an in game shop as long as it doesn't need one to have fun. Diablo III was way, WAY too easy and you had to unlock difficulty modes to make the game fun. If that's the case here, zero chance of me buying it.
I don't think there's much question it'll be that way again. That's just their model for these games. Repeat the same thing at higher difficulties, over and over.