The base model doesn't have the 3200x1800 screen; the model with that screen only has nVidia graphics, and I don't see any option to customize that, so no. No idea if it works with the nouveau driver or not.
UEFI "Secure Boot" is not an issue; you can always turn it off on any x86 system, by design requirement, and several current Linux distributions support booting even with it turned on.
On the other hand, "fastboot" can be an issue: many current Windows systems skip the BIOS screen and don't support USB boot, on the assumption that you'll use the Windows option to shut down and boot into BIOS setup. That option doesn't exist in the Windows setup UI those same systems boot up into when you first get them, thus forcing prospective Linux users to disassemble the system and disconnect the disk to trigger BIOS setup.
