ZCS 5.0 RC2 Documentation Updates?

[Pinarello]

I know there are things more exciting than documentation, but is there other current papers on the RC2 release or 5.0 in general beyond the Release Notes?
http://www.zimbra.com/community/documentation_beta.html

I wonder about things like architectural changes and instant message integration specs and much more. Am I just not looking in the right places? Is documentation developed concurrent with the application or will we see it closer to release date?

Thank you in advance.