Given the website redesign, the repainted J note, the uni leaks, the merchandise out there, there's zero doubt that the Jazz went pretty far down the line of a rebrand to black and highlighter yellow (+possibly white).
The only question remaining is if the rebrand was aborted or is still coming. If we don't see the black and yellow in this next year, then it's likely it was shelved, but there's no scenario where it wasn't a planned thing.