Given one of the core differences in approach, composibility for Clojure and 'convention over configuration' for RoR - I don't think there will ever be a monolithic RoR equivalent in Clojure. Instead the micro-frameworks that are emerging are finding their niches, and are being designed from the ground up to work with other micro-frameworks. Working in tandem these compositions of micro-frameworks are quickly getting mature and I'm sure will be in the same league as RoR soon enough.
What I like about this is it allows you to handle Clojure a micro-framework or middleware at a time. It's easier to digest this way, at least for me: Ring -> Compojure -> Hiccup - Enlive/Comb/Fleet [x] -> Korma -> Friend, followed by Domina, Enfocus and others on the ClojureScript side.
[x]: marks where I am.