Eeeh, at this point, I'm sure we can mark Zorua out in possible starter Pokemon. As there's already been a video showing a Zorua being recruited in a dungeon.
Starter Pokemon are recruitable in other areas of the game. That says it's unlikely, but not impossible. And also keep in mind that it may be a partner but not a starter.
Anyway, I'm kind of disappointed that the video is hinting that there's only 5 starters and no personality test. It made the game feel more personalized that way. I'm thinking if the 5 starter thing is true, I'll go for either Snivy or Axew. The rest of the game looks good so far.
It seems form the video that at at least one stage, you can have your group of Pokemon all at once. I may be wrong and that may just be guild members or town members but yeah.
I think those are just guild members. You wouldn't even be able to have that many Pokemon out normally, it wouldn't make sense to keep track of that many Pokemon.
In addition, to those who are worried about there only being Pikachu, I am certain that you can be other Pokemon. For when they say which Pokemon will be appearing, when they announce Tepig, they show this.
http://www.iaza.com/work/120916C/iaza13221376961200.png
Now that looks pretty much certainly to me like the player as a Tepig. Pikachu is not present in the picture. And the camera is focused on Tepig. Whether or not this is after the maingame, I don't know. But you can definitely be different Pokemon in some way than just PIkachu.
Remember that one menu selection screen where it shows Pikachu, the 5th gen starters, and Axew? That looks like a starter selection screen. So it seems that those will be the starters and no personality test. But I could be wrong on that.
Now we should speculate about the story. According to IGN's top 100 RPG's, Black and White ranked up to #35 due to the leap of improvement and importantly, the deepest and darkest and edgiest story in the franchises history. Let's see if this game can match or out perform Black and White / Black and White 2 in the story category.
Well here's what I can gather from the trailer. Kyurem seems to have a major part in it and I assume his forms will be showcased, which means Reshiram and Zekrom would need to appear (they'll probably be important too). Virizion seems to be the guildmaster, so Terrakion, Cobalion, and maybe Keldeo will likely appear and have a major role. The guild seems to consist of you and your partner, Espeon and Umbreon, Virizion, Gurdurr, two Timburrs, Dunsparce, Emolga, Quagsire, and Scraggy. Hydreigon also appears to be a villain or boss. One scene shows them overlooking a giant ice city or something, probably Kyurem's lair. That's about it. My guess is that if Reshiram and Zekrom will appear, there's going to be a major truth vs. ideals theme in the storyline. Kyurem will probably be a neutral party being fought over. Each of the Musketeer trio is likely to have established separate guilds for training rescue teams (which would explain Terrakion and Cobalion's absence). Virizion's relationship with his partners will probably be explored.