I tried emailing the sales team and the response that I got was that the Linux version that will be installed is a customized Ubuntu with binary drivers.
They also stated that the binary drivers will work with Kernel version 4.4, so it sounds as if Linux support going forward is not going to be great unless they are willing to release source.
On the other hand there has been some other projects working on Cherry Trail support in Linux based around Kernel 4.10 (such as http://linuxiumcomau.blogspot.com/) and it looks as if there is more support for Cherry Trail under the upcoming 4.11 Kernel.
That said, I have heard nothing changes to INT33FE battery management system support under Linux. In a laptop, this bit is rather critical.
As much as I like that they are offering a Linux alternative for their product, the decision to make it rely on binary drivers for one particular kernel version is pretty crippling and I worry about GPD's willingness or ability to maintain driver support for the lifetime of the product.
As much as I like the look of this product, now that I know the detail I may not be getting one after all.