Default Where the chromecast gets its app list?

So the official SDK is released! But the app list doesn't seem to come from: https://clients3.google.com/cast/chr.../device/config anymore.

I've looked around some and there doesn't seem to be any documentation of how the new configs are being retrieved and even how the serial information from the chromecast is being transmitted either. I know it's definitely not the old config URL anymore because that doesn't list new apps like AllCast which works on my chromecast perfectly fine. Anyone know how the new app list is constructed?