From the Kickstarter comments by Larian:
here's the official position on other platforms: At the moment, we're only working on the PC version of the game. That's not because we're not interested in producing a version for Mac, Linux, or consoles, it's just that we want to get the gameplay and world fleshed out in all the detail that it needs first. Once we have the game fleshed out a bit more, we'll start looking at porting it other platforms. That's not something that'll happen during the Kickstarter or indeed this year. But, and it's an important but - we do have most things in place to support several other platforms, since we are starting work from the Divinity:Original Sin - Enhanced Edition engine. We just don稚 want to make any promises now.