Let's pull an Umineko and "turn the chessboard over"...
Okay, so the teaser was overly long. These people are publishers, they are probably aware of how to prepare an engaging teaser. I do not think it very likely that nobody thought the teaser was too long. Which leads to us to the fact that making the teaser so overly long was a deliberate act, done despite the possibility of diminished hype.
If they made it long deliberately, they were trying to convey a message because it is noticeable that they made the teaser overly long on purpose.
What was noticeable in the initial state of the teaser? Four bicolored rectangles, spelling out "0303" with numbers on them.
That leads me to thinking 0303 was significant.
Zero-Three-Zero-Three? Logically, people thought of Zero Escape.
Now, at this point, they are trying to create the impression that this is ZE3. Whether it is deliberate misguidance or an actual teaser for ZE3 remains to be seen.
If it was to mislead people, what would they gain by doing that? Why would they misdirect hype? Do they think some people would be interested in what is being teased nonetheless if it was not ZE3? That remains unclear.
However, it appears more to me that this signifies Zero Escape 3. One could even argue that the repetition means it is coming to two platforms, but that is very far-fetched.