This sounds interesting. A collaborate project. Open source.
I want to see a blog platform at the same height as Wordpress, but written in Ruby on Rails.
Yeah, I know. There's already Jekyll, Octopress, Radiant, Refinery, Middleman, Monologue, Publify, and many more, however none of these, I think, is very customisable and "theme-able" as Wordpress is.
The installation should be just as easy as Wordpress, just upload a folder to a web host and - Bam! - you've got yourself a blog.
One could look at what the guys at Ghost did to make their system beautiful - I really love the fullscreen side-by-side view of the markdown and the preview as well as the dashboard.
Ghost of course has the problem that it is written in Node.js - and no normal person could ever figure that out.
Also the blogging system shouldn't be too bloated, like Wordpress has become. Wordpress is not longer a blogging system, but rather a full fletched CMS. This is not what I want. It should be minimal, simple, and easy. Jekyll is almost there, however they miss out on the easy-for-the-average-guy thing.
Well, that's just my two cents.