Keep an eye on Rockbox.org for updates.
In case this answer hurts your feelings or kills your enthusiasm, please keep in mind that this is a honest and straight answer, meant to give you an unambiguous answer to the question you may be asking. In case you're a developer, all current progress is already upstreamed to Rockbox, and you should be able to continue where I left it. In case you're an end user, interested in "something to install, even if not fully ready", I'm sorry to disappoint you as there's nothing like that available.