There was another trailer that revealed that Kommo-o has a new Z-move called Clangorous Soulblaze which hits both opposing Pokemon in a double battle and boosts all of Kommo-o stats by one stage.
Also, based on the Rockruff chasing the main character in the trailer, it might be safe to assume Pokemon can follow you. If so, that would be awesome. Edit: Never mind. When the main character is running through town slightly later in the trailer, there is no Pokemon following. Oh well.
Another epic thing is that the trailer seems to hint that we'll being going to Kanto. If you look closely, you'll see that Ryuki is standing is standing in a place that looks very similar to Lt. Surge's Gym in Kanto. While I'm a little tired of all the times we've been to Kanto, if we get to go there in Gen 7 as well as Alola, then I can't wait.
Just one other thing. At the end of both of the trailers, does the star at the top of the screen have eyes or is that just me?
Here's the Kommo-o trailer: