There is no real 'feature' that was enabled this week, but there were a whole bunch of formatting updates including this blog (which was also missing in the footer), and overall improvement of the 'responsive design'-ism of the app. Things were ... less great when squished down to mobile size but are much better.
Another feature that is done but not released is going to be part of a new subscription tier which is Event Moderation. Event Reporting helps the Community self-police, but Event Moderation takes it one step further and has all events put for review by the Community Owner before being available on the site.
This, unfortunately adds to the burden a Community Owner has in order to operate the site, so this feature will be released with Community Teams sometime this spring.
This week the main experiment is around some new Community Template ideas. (Which will reveal a whole new set of assumptions around migrating from single-template to multi-template I'm sure.)