That's what I was thinking. Maybe it is Alt and she was able to connect to Arasaka more than what we imagined. The blue color is seen at the end of the video, perhaps ground zero of the blast. It is definitely net-like, maybe she is able to "pop in" to observe Arasaka and the city whenever she wants. The structure of the "blue-web" leaves though...like it shows up only in that spot and goes away. If she is able to observe everything happening around the blast site, she has one hullva one-up on Arasaka.
Whatever the case, it's interesting as hell, and I think CDPR intended every frame to have meaning.