Sweet. runC is awesome and using it is awesome. We are also super excited about the rootless work you personally have been doing, so thanks for your hard work in that area.
I can't take all the credit, Jess Frazelle was the reason that I started to work on an upstream version of binctr. But one of the cool things we can do with the rootless containers work (aside from making the lives of researchers easier -- something I've experienced personally) is to add OCI image building to KIWI (which is (open)SUSE's image building tool) and thus add it to OBS (the Open Build Service which is (open)SUSE's package building tool). I think there's a lot of cool things that will come out of rootless containers. :D
I'm going to be giving a talk about rootless containers at Linux.conf.au 2017 in case anyone is going to be attending.