WiH has a capship command mission and some other new gameplay elements. It's also notable for having non-retarded AI, and both Blueplanets are notable for having some possibly-supernatural elements.
Definitely not, at least by the standards of SF
Science fiction and fantasy are actually not that far apart from each other-the main difference is that sci-fi has more technology and it usually has no blatant magic. However, it sometimes includes technologies and and realms that are so far away from our understanding of the laws of physics that they might as well be.
Major spoilers:
Now, Blueplanet has many elements that could be considered supernatural. For example, Samuel Bei comes back from the dead. It's possible that the Vishnans did this, but then you could argue that their ability to do that would be supernatural.
The Vishnans also have the ability to psychically interact with and manipulate Human minds. Psychic powers such as these exist completely outside of our current understanding of physics, and that makes them a fantastic element. Consider also that many fantasy stories have psychic abilities. The wizards in fantasy also use their minds to manipulate reality, which could be considered a psychic ability.
Some Terrans and Vasudans also have the ability to receive visions from Shivans and Vishnans.
Now, you can try to make it sound scientific--and you are right to--but psychic powers are still essentially magical.
Also, aren't the Vishnans energy beings? As far as we know, no lifeform in the real world can be made only of energy, unless you consider matter a form of energy.
Vishnu is another possibly fantastic element. He exists outside of time, and he seems to have godlike power. Both of these seriously stretch the bounds of reality as we know it.
Of course, I might be wrong. Any sufficiently advanced technology is indistinguishable from magic, and all of these elements could possibly be explained away somehow.
I'm just saying, Blueplanet sometimes looks like science fantasy instead of just regular science fiction.