This has been bothering me (possible spoiler)

In the trailer, when David opens the urn up and lifts its contents up, I'm sure that in the earliest versions of that first trailer, I saw what were easily identifiable as human embryos. In any new trailers we see, the contents of the urn are obscured. And I'm not suggesting human embryos to be in ALL of the urns, but it raises some new questions, I think, if what I saw is true and the image was purposefully obscured by the filmmakers in later versions of the ad because it revealed too much of the plot? Any thoughts?