Ah that would make sense if it was some kind of psychic power, but theres still something going on with that bar code on her head.
And before those creatures were a part of the Swarm, most of them were peaceful animals. Theres one part of SC lore that talks about how the Hydralisk is a friendly herbivore. So they could go "back" to being like that.
I would be willing to bet that the final product is much different than that video. Obviously it'll look different. But for all we know entire parts of the storyline could get changed, and the ending would change with that. So I wouldn't worry too much about it. Blizzard usually delivers when it comes to story and cinematics. I thought the Wings of Liberty stuff was pretty good, so I'd expect the same quality in HotS.
Well by that logic they would also order some take downs of the power point slide, which they haven't done. And this one seems much closer to being real (judging by the voices if anything) than that "plan" for the next 5 years.
I don't think Activision would bother taking it down if it weren't real.
And sorry about the spoiler, I assumed that if you didn't watch the video you wouldn't bother discussing the video you didn't watch, and I figured if you watched the video you don't care about spoilers.