With the Mackerel Pike Festival event for the KanColle browser game ending on October 30th, the recent update introduced a new upgrade for Zuikaku along with new fighter equipment, plus Halloween CG for the Italian Libeccio and Roma was introduced.
Maestrale Class Destroyer Libeccio
Vittorio Veneto Class Fast Battleship Roma
Shoukaku Class Standard Carrier Zuikaku (Second Update)
Shoukaku Class Standard Carrier Zuikaku (Third Update)
The new equipment includes:
Source: KanColle Wiki