The first screencast just shows an overview of the REST API and how the MOP (Model Object for Portal) exposes things like sites, pages, and navigation over REST. The second screencast is where it's a little bit more interesting as it shows how to propogate a site from one portal to another all over REST using a simple tool like cURL.
|REST API Overview||Export/Import over REST|
We've only scratched the surface in GateIn 3.2 in terms of managment and with the extensibility of the management component we are now in a position to easily expose more things in future releases. So stay tuned to more development in this area and you can follow the project out on GitHub.