Observer Mode coming soon to Evolve as a free update

Observer Mode will be released for Evolve as a free update for all platforms, 2K and Turtle Rock have announced.
Evolve — Observer Mode Gameplay [ESRB] Watch on YouTube
The community feature was designed to give Evolve players the ability to observe and add commentary as well as livestream, allowing a sixth user to "passively enter a custom game" with the ability to switch to view any of the five players in the match.
It also includes an "informative HUD" that updates in real-time throughout the match, It shows player health, survival odds, perks, the mini-map, and more.
A release date wasn't provided, by the press release stated the new mode was "coming soon".
More information is available through the official website.