Please be Diablo IV. They may look dated but the Blizzard classics still have quite a community and play nicely on today's PCs (tweak them a little and they'll run at the resolution you need 'em in, too), so I don't see a huge appeal in remaking Diablo 1 or 2. However I'd immediately jump on a Diablo IV, regardless of which chapter it tries to imitate the most.