Finished with classes for today (I did manage to watch the trailer before going to them), so I finally have time to post my thoughts.
When I first saw Type: Null's name, I thought it was referring to a new type while keeping its name a secret. It wasn't until the end of the trailer when I realized that Type: Null was its actual name. It does look pretty unique though, like its a combination of multiple Pokemon. Perhaps it was the ultimate Pokemon fashion of some sort?
Nothing much to say about Jangmo-o and Alola Raticate. I have a feeling its evolution(s) will be Steel/Dragon considering that its scales look pretty metallic, not to mention the website hints that it has some sort of "headstrong" attitude, like its determination is as hard as iron. Alola Raticate's design wasn't what I expected with the emphasis on food.
A 12 hour time difference between the Sun and Moon versions? I think it's a neat concept. It seems like in the Moon version, you could be playing the game during the day, but it will actually be dark in-game. I'm getting Sun though, so that means I'm going to see a more usual time and day feature. The version different Totem Pokemon concept is pretty neat too, especially how Gumshoos and Alola Raticate are used.
Aether Foundation was probably my favorite part of the news. It turns out that artificial island is their base, and it seems they are pretty simple folks at first considering how they are around to oppose Team Skull. When I look back at them though, I can't help but think they have the potential to be the real bad guys. Lusamine looks like a pretty mysterious character, and I wouldn't be surprised she turned out to be the main villain in the story for reasons we don't know yet.
Gladion looks like a cool character. He looks like someone that will have a major impact to the plot, perhaps even more than Guzma and Plumeria. It's interesting to see that he has Type: Null on his team. Makes me wonder what kind of connection he has to it, especially for other information I'll get to later.
Very nice to see Dexio and Sina make a return from X and Y. Makes sense that they are the ones that introduce to you about Zygarde since all three are from Kalos after all. Not surprised that the device will help you find Zygarde Cells and Cores during your adventure considering it's mostly information we already know.
Pokefinder looks like a fun feature. I'm glad they expanded the photo-taking feature from X/Y to the point we have a Pokemon Snap-like system in the main series games.
And UB-01... now this is interesting. It looks similar to Lillie, and its description even states its actions are similar to that of a young girl's. Perhaps Lillie is UB-01 but in human form? I'm really curious to see how these "Ultra Beasts" will impact the story.
I know Zoroarking already beat me to it, but when I first heard about how Lillie and UB-01 could be connected, I notice that Lusamine looks a lot like Lillie. A few hours later, I hear theories being further expanded about how even Gladion could be related to the two. I mean, look at all of them side by side.
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My guess is that Lillie is either Lusamine's sisterand could be an artificial-being (those ultra beasts look like they were made in labs). As for Gladion, he looks like he could be their brother, and maybe he broke away from the Aether Foundation for reasons that will be revealed in the story (perhaps it could have something to do with the Aether Foundation being secretly evil).