This was posted on the kickstarter page about an hour ago, I waited if it would be posted officially here on the forum but as that hasn't happened:
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Larian Studios LLC about 1 hour ago

We definitely haven't forgotten about it and are busy with it. The problem here was that we needed to align three constellations but that's almost done. Everybody who didn't use their Steam key can already get their GOG version, and everybody who used their Steam key can already play via Steam. The only problem left on this front is the transition. But the save games that you make with your Steam version are compatible with the GOG version, so once we're done (which I hope is today), you'll be able to make transition smoothly. We prioritised the people who didn't use their Steam key as we figured that if people were already playing on Steam, it wouldn't be that much of a problem to wait a few more days.
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Apparently Larian still hasn't realised that the people who gave away their alpha/beta keys to promote the game cannot play at all. Or maybe they really think "it wouldn't be that much of a problem to wait a few more days." Which is just unbelievable.