Gintama's Battle on Rakuyo arc is rushing towards its conclusion, and this week's episode 327/11, "The First Student," ended with a message about important news coming next week.
Is it about the anime? The live-action movie? The manga? TBD...
As announced earlier this month, coming in April, CHiCO with HoneyWorks return for the opening (2015's Shinigami and Confession arcs, along with comedy episodes) featuring their "Pride Kakumei." XY is on ending "We Gotta Fight."