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 "On August 17, 2011, Shueisha's V-Jump magazine announced a sequel set one year later, a third arc of Xros Wars subtitled The Young Hunters Who Leapt Through Time, which aired from October 2, 2011 to March 25, 2012, following on from the previous arc.". Is that enough to answer the question?
Answer: yes