From the article that was posted:

The main new feature is support for I2P, the Invisble Internet Project. It uses a fully encrypted privacy network layer to hide user activity and locations. The network does not use servers. Peers contributed "a portion of their resources" to other network particpants.

The maintainers promise that "non one can see where traffic is coming from, where it is going, or what the contents are" when the Invisible Internet Project is active.