Arknights CN: Developer Note #27: Leaves Catching Fire Limited Collab Event, CC#12: Origin, Improved Readiness

Frozen leaves turn red, autumn once again visits a deserted mountainous land in Higashi.
Following which are a few unusual visitors.
Destiny burns in the sky.
The spotted blade will be illuminated by the firelight.

Limited Collaboration Side Story Leaves Chasing Fire will open in March. There will be new maps and story along with new operators, costumes, and furniture.

Collab operators can only be obtained from Limited Banner [Hunting Triumph].

(Not mentioned, but most likely Monster Hunter collab)

2: CC #12: Operation Origin

This is the final season of CC. Besides new risks and maps, there will be new costume, rerun costumes, furniture and rewards to exchange. At the same time, you can get medals relating to the seasonal challenge.

(CC Beta remake? Check out the theorycrafting)

3: Improved Readiness

Main Theme progression event will be in March. The event will open new Main Theme related missions. When completed, all operators' trust levels will be increased.