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It's not E-ink, but a transflective LCD that has much faster refresh rates.
The founder posted that the tablet will come with Android by default but will get an unlocked bootloader to run plain Linux (hopefully with upstream kernel, that's still to see): https://news.ycombinator.com/item?id=40459958
Michael The Linux support might be interesting enough for a standalone article. The full HN thread https://news.ycombinator.com/item?id=40456834 has lots of info.