What is the status on Mac and Linux?
Linux and Mac is something that was planned from the start. This is our engine, so we can do with it what we want. It had build targets for OpenGL (the graphics renderer on Mac and Linux) that actually worked at some point, but along the way we decided to postpone that support and focus on gameplay. We are still going to do this, but probably after the Windows version is finished. All the owners of Divinity: Original Sin, however, will receive these versions for free.