It's time to re-enter the Matrix.

After many months of build-up, the first trailer for the fourth "Matrix" movie is finally here: "The Matrix Resurrections." What does it all mean? It's hard to say, but it certainly all looks familiar. Is it regular old deja vu? Or is it a glitch in the Matrix?

Whatever's going on, Keanu Reeves and Carrie-Anne Moss are back as Neo and Trinity (apparently, at least), with Yahya Abdul-Mateen joining as a character who seems to look a lot like Laurence Fishburne's Morpheus. But this is the Matrix, after all — odds are, nothing is as it seems.