Today Warframe held Devstream #158 where they revealed an official cinematic trailer for The New War, which was amazing, you can watch below. The Devstream also gave some information about the upcoming New War quest, a look at the new upcoming frame named Caliban that looks sentient, and Harrow Prime is the next Prime frame. The trailer also states that The New War quest is coming on December 15th. You can watch the full devstream #158 here on Warframe's YouTube channel.
Warframe | The New War Cinematic Trailer: Discover Your Power Within
Video description: The New War heralds Warframe's most ambitious, cinematic expansion -- and the darkest chapter yet in the conflict against Erra and the Sentients. Embark on an epic Quest across an expansive new adventure, as you race to unite the factions and conclude the most dramatic conflict burning in the Origin System - the one within yourself.