What new features and improvements does Lithium provide over CakePHP?

I've used CakePHP on several projects in the past, and have more recently started using Ruby on Rails, but there's a new project I'm about to start that will require PHP. While refreshing myself on CakePHP I learned that there is a new framework called Lithium that is essentially what CakePHP 3 was going to be. It's being developed by a group of former core CakePHP devs.

I haven't found a whole lot of information about it since it's still under development status, but I was wondering if anyone knows (or has a link to) some information on what benefits it provides over CakePHP. Hopefully something a bit beyond the quick overview shown on the official site. I'm trying to decide whether to use CakePHP for my upcoming PHP project or to wait a bit for Lithium to release a non-development version and try that out.