Diablo 4 was just announced with an awesome new cinematic trailer at Blizzcon 2019. Check out the first look at combat in the Diablo 4 Gameplay Trailer.

New Gameplay Trailer

Some basic abilities are shown for each class in the Diablo 4 Gameplay Trailer:

Sorceress appears to cast blizzard and ice bolt to eventually freeze enemies in place which she then shatters with a meteor and fireball.

The Barbarian does a shockwave and kick before smashing enemies with a leap attack down a cliff. He appears to swap between dual wielding and a two-handed weapon fluidly.

Finally the druid casts some lightning spells before pushing back enemies and transforming into a Werebear that smashes the ground for an AoE attack. He then transforms back into a human and casts another lightning skill.