Listen we get it, you really, really dislike pokemon following...
Anyways, back to the topic, it does seem like that what we believed to be pokemon following is actually turning out to be interacting and animated background over-world pokemon. It does seem like a cool feature to help flesh out the region and give it more life. To be honest, when I first saw the Rockruff preview, I originally thought it was going to be something akin to just over-world pokemon interaction. I actually had to read someone else bring up the possibility of Following Pokemon to think that that was also a possibility.
I will admit, I do think it was a very weird choice for Game Freak to use that incredibly short Rockruff clip to spoil the over world interaction pokemon as if it was some major secret that they had to hide by only showing an incredibly short clip of it. I don't really see it as something that would be a major selling point to their fan base. In hindsight it almost seems like a troll, since it was so easy to mistake that clip for following pokemon, how could they not see how that clip could be misleading?