A post from Blizzard discusses plans for Diablo II: Resurrected, talking about console lobbies, TCP/IP, and ultrawide monitor support. The last two are of concern to PC users, as there is more on why the revived action/RPG will not support TCP/IP networking due to security issues. There's also the confession that ultrawide monitor support is incomplete because of the work it would require. Let's just pretend 32:9 monitors don't exist as we read about how 21:9 monitors will be limited to 19:9:

Ultrawide monitor support being modified was a subject we saw heavily discussed across our channels following the Beta. In the Technical Alpha, players with Ultrawide hardware saw their full 21:9 screens utilized during that test. However, during that test we identified limitations affecting those players and others. For example, the AI failed to sense the player and trigger attacks. Furthermore, players with 21:9 monitors were able to pull many more monsters into battle at a range limit beyond the original game’s intention. In a scenario where players (for example: playing a ranged class) were attacking monsters, players with 21:9 monitors could hit enemies with that extra screen space, but the monsters would not pull or react, but could still be defeated. Ultimately, the AI doesn’t register getting hit from that additional distance a 21:9 monitor provides. That’s not intended, especially if you’re sharing a game with a 16:9 user. To protect the integrity of everyone’s experience and promote an equal playing field for all, those with Ultrawide monitors will be able to have their game screen purview extended to 19:9 (the maximum length of the in-game limitation zones) with a vignette on the sides of the game screen. We recognize that players have spent a lot of money to assemble their 21:9 hardware setups and seeing black bars may be frustrating for their experience. So, we’ll continue to watch these discussions and explore possible solutions that don’t change how the game is played.