It was added a couple hours after the stream. You can find playthroughs on video game news sites if you want (which I am avoiding).

Is this newly added to the site? I don't remember seeing it before.

"A massive Fallen ketch has been spotted over the Moon, and a crew of Fallen cutthroats led by the ruthless mercenary Taniks the Scarred seeks to plunder the Hive’s darkest secrets. Guardian Fireteams are tasked with infiltrating the ketch and defeating Taniks before he can secure his prize."

Click the new strike button

I just wanted to note that in one of the screen shots, there is a walker INSIDE the ship... it could be a loading bay, but I think it's awesome that you might have to fight one of those in a closed space :-)