For what it's worth, I have a Dell XPS 15 bought in January 2016, with i7-6700HQ Skylake CPU, and I think it has an NVMe drive (at least the drive ID says so). It's the basic model without a touch screen.
I run Debian-testing (aka Stretch), which ships with linux 4.4 and Wayland. I had weird issues with X11, but I had blamed that on the NVidia/dual-card setup which I did not bother investigating.
Besides that, I've had no issues at all with the laptop. I haven't even run the BIOS update yet. Only annoyance was the lack of select-to-copy in Wayland/Gnome, which apparently is fixed in the new version. :-)
I run Debian-testing (aka Stretch), which ships with linux 4.4 and Wayland. I had weird issues with X11, but I had blamed that on the NVidia/dual-card setup which I did not bother investigating.
Besides that, I've had no issues at all with the laptop. I haven't even run the BIOS update yet. Only annoyance was the lack of select-to-copy in Wayland/Gnome, which apparently is fixed in the new version. :-)