Bill says that she "serves chips". Obviously this doesn't tell us much but at least suggest Bill is from a fairly ordinary background like most recent companions.
The Doctor is some sort of teacher or lecturer here. Maybe Bill is also a student and the chip serving is just a part-time job? That would explain how they end up meeting anyway. Is the Doctor undercover here a la School Reunion?
Nardole is still around. He doesn't appear too much in this trailer but he's certainly present. I would assume he will play a similar small role like in The Return of Doctor Mysterio and maybe doesn't leave the TARDIS in every episode.
An alien/ futuristic city. Looks pretty awesome but no idea what it actually is.
This is one of many shots showing a historical episode. The Doctor and Bill are in historical dress for it. It's unclear exactly when/where it is but it looks maybe 18th or 19th century.
A blue-skinned alien. Lots of shots from the trailer appear to be from this futuristic episode where the majority of the cast seem to be in some sort of spacesuit.
It's unclear where the Doctor and Bill are here. It looks to be some sort of vault or catacombs. It's enormous whatever it is.
This appears to be some sort of wooden alien. It looks a lot like the walking trees in The Doctor, The Widow and the Wardrobe but it would be odd for them to return.
Smiley robots. These look friendly but I suspect they may end up being rather nasty. Note that their eyes are exclamation marks in this image.
Very hard to get a clear screenshot of this. There's a big war involving the daleks and someone is thrown against a wall. It looks like a Movellan from Destiny of the Daleks. I might be tempted to suggest that it's just their hair but there are definitely two character in this shot with that hair. Maybe the Movellans are back!
Here's a closer look at those spacesuits from the futuristic episode. It's interesting that no characters are ever shown wearing a helmet so it's not clear why they are all wearing spacesuits. Nardole is here, the only time he's shown outside of the TARDIS in the trailer other than a brief encounter with a dalek.
The Doctor saves a small boy in the historical episode. What on Earth is the Doctor wearing here? It looks like a steampunk spacesuit. Maybe it's a diving suit but why is he wearing it?
Ther Doctor's wearing shades again. There's loads of people in the TARDIS here, more than ten by the looks of it, and they look like they might be monks or something similar. Has the Doctor rescued them?
The Doctor punches someone! Full on punches them in the face! That's not normal is it? The set and costumes look historical so it is probably from the same episode we've seen a fair bit of.
The Series looks a lot of fun in my mind and that's bearing in mind it doesn't look like we've seen much of it here. A tiny bit from a contemporary opening episode, a historical 18th/19th century episode, a futuristic in spacesuits episode and dalek war episode.Those last two may be one and the same and it's not clear where the city and the robots fit in either. Still, that's a long way a full series of episodes so there's a lot more to see!