DSOGaming reports on some new screenshots and videos for Diablo 4. More videos can be found at the link.
More information.The gameplay videos showcase some environments, like the Scosglen Coast area, the Orbei Monastery, Kyovashad Night and Flooded Depths.
From what we know so far, Diablo IV will be an always-online game, and will not offer an offline mode. We also don't know whether Blizzard will allow modders to enable an unofficial offline mode or not.
The game will also have cosmetic micro-transactions. Additionally, Blizzard is looking into enabling cross-play support between all platforms.