I've recently been doing a bit of work with Rails Engines, specifically looking into getting RefineryCMS and Spree working on the same install but information as to what is planned and has been developed on edge rails is scarse. So I'm wondering if there is somewhere I've missed where people outline the plans for Rails+1.

I've investigated:

* The mailing list
* Lighthouse
* The Google (good information on what has been done, not what is planned)
* The github history (commit messages aren't usually that helpful)