Some more things I noticed during watch #1,239 of the trailer and related materials:
There was a promo released last week right after the trailer that included a brief conversation between a man and a woman like the one from the beginning of the first movie.
I
think there are two new character names in there. The woman seems to call the man "Seek" and I think the guy calls her "Bugs." The woman's voice could very well be Jessica Henwick as well.
There are not a lot of sound effects in the trailer, but there's one for Trinity's bracelet, oddly enough.
The city in the trailer is pretty recognizably San Fransisco while the city in the previous films was a generic "Mega City," though with some nods to the Wachowski's hometown of Chicago. Other cities do exist in the Matrix, though, as Neo is researching Morpheus appearing at Heathrow Airport at the beginning of the first movie.
While many people have brought up the use of the colors blue and red in the trailer, there's also quite a bit of gold. There are several shots with golden lighting and at the end, there is even gold code streaming upwards:
Gold was used to represent the Source and the machine world in the sequels. Seraph was also gold, though it appears that no one is entirely sure why.
They had the idea for a trilogy from the very beginning according to the Matrix Revisited, they even wanted to release them the way they did years later.
On a kind of related note, there's
a script floating around that claims to be for Reloaded, but from April 1999. I am dubious of its authenticity both because it seems too early for such a thing to exist and also because it is, from what I've read about it, quite different from the movie we got. I'm in such a Matrix mood right now that I might read it anyway though lol.