As you may know from the relevant Knowledge Base page output caching for DotNest sites are managed by a reverse proxy: this means that a server is sitting in front of DotNest, caching pages and serving cached pages instantly.
This proxy cache now got smarter: by utilizing the services of the built-in OutputCache module cache entries are now evicted immediately if a change is published! Caching still happens on the proxy, but now if you e.g. publish a new blogpost then all the relevant cache entries are cleared so your users can see the change instantly! Best of both worlds!