This post refers to the capsule seen in the background of the latest sneak peeks.
I believe that the update will bring integrated propulsion systems for capsules. First, let's ask, "why is it there?" I think there are 2 possibilities: it was intentional, or unintentional.
First, let's assume that the dev intended it to be in the background. Why, then, would he go on to disappoint the community, by leaving a red herring? It's more likely that it will be a part of the capsule.
Now let's assume that it was unintentional. Then: 1) the dev was testing the capsule's systems, or 2) he was playing around. I feel like the first is more likely, though I am not sure.
In conclusion, capsules may have engines on them.
Oh @SupremeDorian