I have just noticed these, not sure how long they have been out, for:
https://www.itead.cc/wiki/Nextion_HMI_Solutionamazon and the usual places have them for $20 and up.
they seem to have internal engines to run gui code (seems to be windows-only on creation, sigh) and sends simple events (?) over serial to the cpu.
seems a bit expensive but maybe it has some use. maybe getting a quick gui done is what its all about. then again, you have to run the win app and learn their system, and that's one more thing that can't be automated or integrated into a simple build system.
curious what people think about this and if its worth looking into, or buggy or lack of support, or changing apis too often, etc?