In terms of gameplay, the only thing that Blizzard noted that has been changed are the quality-of-life improvements. One example is the larger stash. For those who want to see the change in graphics between the original and the remaster on the fly, the option is there too. And this is done with a single button press.
Diablo 2: Resurrected will release on 23 September on PC, both console generations, and the Nintendo Switch. Blizzard say there’s cross progression, which is great. Though crossplay, while available on PC and consoles, is not available on the Nintendo Switch.
The game is also available for pre-order. Those who do will be able to access its multiplayer open beta in August. During which five of the seven classes – Amazon, Barbarian, Paladin, Sorceress and Druid – will be available. Not sure if you can muck about with your old save file during this period.