The in-progress Sarien Chromebook looks to be a clamshell while the related Arcada device will be a 2-in-1. Yet both will have a remapped hardware keyboard that appears to bring traditional Function keys to Chrome OS and Linux.
Aside from the Samsung Chromebook Plus v2, there aren’t any recent Chrome OS devices with integrated LTE. Based on code commits, these new devices running on Intel’s Whiskey Lake CPUs may include this connectivity option.