Documenting new features
The best place to document Samba features is in the code itself, i.e. by writing great man-pages and samba-tool help. Writing a good WHATSNEW.txt description is also a great way to let existing Samba users know about a new feature. However, documenting new and updated features on the Samba wiki is also useful, and can be a helpful way for a new Samba user to work out what Samba can and cannot do.
There's a template to help you get started. Just create a new page and save it with the following content:
Through the magic of mediawiki templating, this will create a skeleton page. Replace the <...> markers in each section with your own content.