Looks to be very similar to the Starcraft remaster. No truly new features, just the new visuals which can be toggled, and stash upgrades. I'll buy it and play it for a bit with friends and then probably never touch it again. It looks fine.
So...is D2 going to overshadow D4?
edit: also, is blizzard now just reduced to a company that remasters its own games? i get that OW is successful....but outside of they, they haven't really had any new games/IP in what seems like forever.
D2 remaster later this year, D4 sometime 2022 or later, I don't think they'll clash significantly for most people. The D4 showcase in 2019 pandered pretty hard to a particular group of D2 fans, but if they end up unhappy with D4 they'll just go back to playing D2. If the remaster wasn't a thing they'd go back to the original. I'm sure there will be a vocal contingent that does just that. Most people will just play D4.
Some fans have been very vocal about a D2 remaster for quite a while but just like with design of a new game, fans shouting for something doesn't tell you how to make it good. People know what they like, they don't necessarily know what they want. What's the right way to do a remaster? We've had plenty of examples of good, bad, and just OK over the last 8 or 9 years, but it's still a tough position for a developer to be in.
Blizzard put stuff out fairly rapidly in the 90's, as was the case for most developers. When Starcraft launched in 1998 they had about 50 employees. By the time WoW launched in 2004 it was 400, mostly due to WoW and the additional types of people needed to develop an MMO. Then it quadrupled over the next year to support WoW. I'm sure they spent most of the latter half of the 2000's just trying to keep up with the growth of WoW. After SC2 and D3 launched the industry started transitioning to games as a service. Release cadence was alright for a few years there from SC2 to Overwatch, but other than WoW expansions we haven't had anything new in the 5 years since. With continued support of existing games combined with increased development costs/time of most modern games it isn't a surprise that their release cadence has slowed even more. When you consider that they have separate teams working on different properties you might expect a more steady drip or releases or at least new content. It's a little frustrating when I'm in the mood for one of their games, but I have so much else to play I don't worry about it too much.
Blizzard truly is a shell of it's former self, however. The days of really pushing the boundaries in a genre are behind them and they seem to have shifted to putting out highly polished genre capstones (i.e. Overwatch) and reliving their past glory through various remasters.
That's most game developers though these days, and it's not necessarily out of laziness. Game genres expanded pretty significantly in the late 90's and early 2000's. A lot of people (fans) latched on hard to specific ideas. Developers want to create something new and not retread too much, but it's a fine line to walk. How many sequels have fallen flat or had a divided fanbase over the years because people felt they either changed too much or didn't do anything new? D3 failed for some people because it wasn't D2, and even that group was sometimes split over whether it was the visuals or the mechanics (skill trees). It failed for others because of a few specific design decisions (RMAH, loot system, replayability due to campaign structure), but many of those people are now happy with the game after the RoS changes. Some of the former group bought in after that, some didn't. Game development is hard.