It's a C710-2847. I just found out that it's a 64-bit installation by default
following the ChromeOS->ChrUbuntu->Trisquel upgrade path. I prefer 32-bit,
but I am not sure whether it's possible with ChrUbuntu. It took me a while to
get it setup to my liking (removing that yucky unity-greeter and
Trisquelizing the gdm theme).
There is this video where someone got to run GRUB on the C7:
http://www.youtube.com/watch?v=eKylYaWbb-E&html5=1
They might be close to figuring out how to install other OS's on the C7
"normally". I hope they do, as that "OS verification" screen at bootup is
starting to annoy me.