The trailer for Spider-Man: Brand New Day has become one of the most significant phenomena in recent cinema after achieving record-breaking viewership in record time. However, beyond the media impact, what has truly caught attention is the type of speculation it has generated.
Unlike other trailers in the genre, this one features no villains, shows no clear confrontations, and avoids any scene that would allow for identifying the main plot. This forces the analysis to focus on the visible details.

An Isolated Protagonist
The Spider-Man: Brand New Day trailer confirms that Peter Parker is still completely alone after the events of Spider-Man: No Way Home, where he accepts that the world forgets who he is through a spell that erases his identity from everyone's memory, thus losing all personal ties.
From there, the most widespread theories suggest that this isolation could be the trigger for his deepest transformation. Part of the fandom suggests that solitude is accelerating Peter Parker's mutation.
Other interpretations go further, suggesting that this process could lead to a darker version of the character, where the main conflict would not be external, but internal.
We also have here a letter written by Peter that a fan took the trouble to translate despite its fleeting appearance, it says:
“Hi, my name is Peter Parker, and you don’t remember me, but I have something to tell you that’s going to sound crazy. It’s the truth, and I know you’re going to believe me, because you’re so good at knowing when I’m lying.
We used to know each other. We were together. But something bad was going to happen to the world and the only way to stop it was to make everyone forget about me. Because I’m not just Peter Parker, I’m Spider-Man.
And sometimes, Spider-Man has to do the hard thing, even if it breaks Peter Parker’s heart. Maybe you’ll never read this. Maybe I’m just writing this for myself. Maybe that’s my responsibility. To live alone with the truth.
But the truth is, I love you. And I hope deep down, something inside you (remembers?) that you love me too.”
This has led to speculation, not only that the burden of being forgotten is beginning to weigh on his shoulders, but that he might be torn between approaching his former girlfriend or not, and that he might be tempted to reveal his identity.
In this same vein, many fans have speculated that she might again discover his identity as Spider-Man on her own, or that he might reveal it, leading to two different viewpoints: that she would believe him, as her instinct had told her so before, and she might feel familiar with him; or that she would not believe him, as she doesn't remember him well enough to detect anything strange in his behavior, given that she would remember him always as Spider-Man, so his actions wouldn't feel different to her...

Villains: The Visible Absence as the Main Clue
Another key aspect of the Spider-Man: Brand New Day trailer is that no identifiable villain appears. There are no clear faces or silhouettes that allow for recognizing a specific enemy, although a combat scene is shown at the end of the preview without revealing the identity of those involved.
However, in several sequences, a strange phenomenon is perceived: something invisible seems to move from one body to another, as if a presence passes between different people to escape. It is not shown directly, but the effect is there and has been noted by part of the fandom. Furthermore, there is a mention in the trailer itself of facing an enemy they cannot see.
From what is visible, several interpretations emerge. One of the most commented on is that this "something" could be an entity linked to the multiverse, even interpreted by some as a kind of presence or consciousness that uses bodies to move undetected.
For those who don't give relevance to that detail, the theories go in another direction: that Spider-Man himself could become the axis of the conflict, not necessarily as a traditional villain, but as an unstable figure, supported by Banner's comment that, if he is mutating, it could be dangerous.

Changes in Visual Approach
The Spider-Man: Brand New Day trailer includes action and combat scenes, with visible confrontations at different points in the preview. However, it does not focus its promotion on large destructions or spectacular explosions.
Based on this, theories focus on the possible tone of the story. Some fans suggest that a storyline related to the loss of control over Peter Parker's abilities could be explored, while others interpret that the approach could be darker, centered on the consequences of that possible mutation.

Changes in the Character's Powers: The Most Important Speculation
One of the most widespread debates surrounding Spider-Man revolves around the evolution of his powers and what that implies for his very nature.
Throughout different stories, it has been suggested that his abilities are not static, but can develop over time, becoming more precise, more intense, and even more arachnid-like than human. This idea has led many to interpret that he is not just a hero who improves, but someone who could be progressively transforming into something different.
On the one hand, there are those who argue that this evolution is a logical extension of his origin: if his powers come from a biological alteration, it is consistent that this alteration continues to adapt.
In this context, the trailer reinforces the idea of this possible change by showing the character hanging from a web outside a window, not wearing his suit. The scene suggests that the web was created by himself, in a state of sleepwalking or unconsciousness and not through the technological devices he used, which suggests that this version of Spider-Man would not be one that depends on technology, but one that possesses biological webs on its own.
The presence of figures like Hulk in his human form is also shown, at a moment when he seems to explain to Peter Parker the transformation process and the phases related to a spider. This interaction points directly to the idea that the character could be going through an initial phase of change, linked to the origin or intensification of his powers. In this part, it is mentioned that a spider goes through three phases of transformation during which it is vulnerable, and if it survives, it could be considered a rebirth, something that can be thought to allude to the film's title indirectly.
This fact is what leads many fans to consider that this Spider-Man could be Man-Spider, the "Spider-Man," and that the mutation leads him to cross the border of what is human.
Some fans interpret that, as Spider-Man and the X-Men have shared stories in the comics in which Parker is even a professor within the mutants' school, Marvel is trying with this film to leave the door open for a next one that includes that connection, even speculating that this Spider-Man could be the one who goes to Charles Xavier for help.