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I don't work for Laminar and certainly can't speak for them but this thread from May 2015 appears to be the most recent official word on the subject, implying "some day" at least to the extent it becomes possible to generalise between that and Rift...? I too have Cardboard and wish the news was better, but I can understand that the tech is, even now a year on from those comments, still in flux and hard to work with. For example, Google Daydream was just announced.
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