Four things I noticed in the trailer:

1. In NPH psychiatrists office, he has butterflies and little glass baubles that are red and blue respectively that sit opposite of one another. I wonder if the implication is that he is the one who created/wrote the code of the red and blue pills.

2. We see the machine's operating on Neo's body in a series of flashcuts and his eyes are burnt and sealed shut just like in revolutions....so this is 100% a resurrection in the literal sense. The machines can grow human beings so this honestly isn't that out there.

3. We see trinities body in "the real world" (pin in that one). She has a tube connected to her head with blue LEDS....not unlike the blue pills actually. She also has what almost looks like blue code running down her face, although that could just be a trick of lighting and her being covered in liquid of some kind.

4. We see a videoprojector in a room playing the first matrix film.