Why yes, there WILL be controller support and split screen for PC. Check out our latest Kickstarter update for the details on that, plus, news on skills, ghost talking, skill crafting, rune crafting, death animations and the noblest of hats.
Check out this link: https://www.kickstarter.com/projects/larianstudios/divinity-original-sin-2/posts/1947157.
Let us know what you think!