As far as specific details about this version go, we know that it'll pack in "all content up to date" for the Mac and Windows releases of SS3. There's also a screenshot to accompany this news, complete with an obligatory penguin.
For everyone else, Devolver CFO Fork Parker had this to say: "We're in the process of integrating Steamworks and achievements and the whole shebang, but we can’t get the little f*cker of a penguin to stand still. The last time I had anything 'Open Sourced' I was in Thailand, if you catch my drift."
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