There's also OSTree - it's a more invasive vision, as it forces *every upgrade* to be atomic, and at present, you need to reboot. But on the plus side, every upgrade is atomic =) And by virtue of being constantly used, it's also constantly tested in real world scenarios.
I should also mention that it actually works today. See:
for demo VM images to download (and if you're brave, you can install on bare metal).
Also, the video from devconf.cz is online now:
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