Starlite Mk IV is my favourite "netbook" successor. 0.9 kg, 11.6 1080p IPS display and Linux-first, with coreboot. Unfortunately it is a couple years old by now and you can feel that (Intel N5030 and 8GB of RAM). Sadly the company changed the form factor of Mk V to a detachable but if you can live with that it's also an option.