Fortress allows us to do a number of really cool things that are not available in the ECM. One of them is to no longer require the accursed "Roles" file. Adding new user components to Cocoon and having the configuration able to use those components directly is just as simple as including the new JAR in the classpath.
Startup times can be optimized as much as possible either by using asyncronous component startup or by using request based startup. To top it off, you also have early warning in case there is some circular component dependency.
It will require some code changes to some parts of Cocoon, namely the Sitemap and the core Cocoon component.
I would like to help with the upgrade, but I don't want to upset any near releases that might be pending.
-- "You know the world is going crazy when the best rapper is a white guy, the best golfer is a black guy, The Swiss hold the America's Cup, France is accusing the US of arrogance, and Germany doesn't want to go to war. And the 3 most powerful men in America are named 'Bush', 'Dick', and 'Colon' (sic)".
-----Chris Rock