It's always nice to read a writeup on Flux.
I would love to hear more about possible isomorphic implementation of the architecture though. Right now besides Fluxible the architecture doesn't play well with server side rendering.
By the way, shameless plug, I wrote an article on Flux (backed by a Rails API) a while ago, if you're interested on the matter: http://fancypixel.github.io/blog/2015/01/28/react-plus-flux-...