Okay, the challenge has been released!
I've linked the challenge document on the sidebar. It is also on Google Docs. This is a document we all need to study and become very familiar with.
The game designer has a YouTube video in which he discusses the missions:
It is also linked on the sidebar here for future reference.
There are two other official videos you should watch. First, the challenge release video:
And second, interviews with the challenge experts (this is less than 7 minutes):
