EDIT: so, the sailors and the ceremony itself looks like it might be taking place inside the drydock on some kind of platform. Presumably the second hull's keel therefore would be "behind" the ceremony platform, out of sight because it has a lower profile and because it would be out of frame.
.... or, this is on the other side of the yard overlooking the drydock (and not inside the drydock), and the reason we can't see the second hull is because it's lower in the drydock being only a keel/lower hull at this time. It's a bit hard to pin down whether this is taken at the edge overlooking the drydock or actually inside the drydock.
It would make more sense to be on the edge, because holding the ceremony inside the drydock doesn't really make sense. The fact that we can see the lower hull of hull 1 including the bulbous bow throws me off a bit.
I expect we'll get launch pictures from other perspectives in time, to confirm the presence of hull 2 in the drydock.
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I like the before/after pic of the launch ceremony. It can be set up like the drake meme.