The existing keys will not be revoked. It makes the transition a lot easier. We indeed planned originally to destroy them but since the large majority wants a Steam key, that doesn't really make sense as you would have to re-download everything (10GB). That's why we adapted our approach.
From Larian on kickstarter 30 mins ago!
That's bad.
I gave the duo key to a YouTuber because I wanted him to make a video about Original Sin, but it belonged to a friend of mine.
I did it because they said that the keys would be different, but it seems they've changed their ideas...
