I want to know the answer to the following question:
When was the sequel announcement for the third arc?
All the background I'm provided with is that "The series finale reintroduces the heroes of the previous five seasons as they all come together and help the current heroes in the final battle due to the fact that the DigiQuartz is essentially a tear in Space and Time, allowing all of the Digimon universes to converge.". Is that enough to answer the question?