devtrackers.gg
Just so people don't freak out about the new trailer being only act one, DE replied to a YouTube comment clarifying that it's all coming out at once, they're just keeping the rest a secret until launch.
External link →We're keeping Acts 2 and 3 a secret until launch, Tenno! This is just a taste of what's to come. The full Quest will be released on December 15.