No, but it was mentioned enough that I'll be greatly disappointed, and a bit angry, if we don't get a Linux version, especially since my sound just went out.
[edit] Actually, with a bit of search, they promised it:
Confirmed: Coming to Linux & Mac!
It's about time, but we are extremely happy to announce that Divinity: Original Sin will now definitely be coming to Mac & Linux. We will do everything we can to ensure that the release dates are going to coincide with the Windows PC release, but if that doesn't happen, it will be shortly after.
