Diablo II: Resurrected was revealed earlier today, and it's giving the original Diablo II a very shiny coat of paint. That said, the gameplay mechanics and core features of the original Diablo II are very much in tact. Rod Fergusson, executive producer of the Diablo franchise, spoke about this in an interview with Polygon.
“This isn’t a remake. We’re not reverse-engineering it; we’re not rebuilding it and trying to make it look and sound like [Diablo 2]. This is [Diablo 2]. [...] It’s right there, underneath the surface. The entire simulation, the engine for this game, that lifeblood of this game, is [Diablo 2] right underneath. So there’s a toggle switch, a legacy toggle, that when you press the button, you’ll see behind the curtains, and there is Diablo 2 in 2D sprites running right there, and you can play the way that you played 20 years ago.”