Everything under "The Future" really excites me, especially the geo-partitioning features. That is something that I'm really looking forward to be using!
If you have a marketing webpage, you might have a link to signup or login pages. If you can hijack the index page you'll also be able to hijack the links.
This is not the case for apps such as Netflix, YouTube, and HBO. They all stream directly to the Chromecast from your internet connection, your browser or app on your phone just acts as a remote.
1: https://www.patreon.com/evanyou