Divinity 3 is still coming, just not as soon as people thought. Maybe Larian needed to do a smaller title first (blog post Organic development – how random ideas became strategy) so they will be able to make Divinity 3 as desired (The route to the very big RPG that will dwarf them all). Or maybe they wanted a break from the DD/DKS story line, or to try some things out. Dragon Commander started off as a small project for possible DLC and then grew into a full game.