Available nationwide from 29th January, they come in three new flavours:

KitKat Double Chocolate: Featuring a cocoa-flavoured filling, covered with thick, milk & dark chocolate marbled swirls.
  
KitKat Salted Caramel: A salted caramel-flavoured filling, covered with thick caramel flavour milk chocolate and marbled swirls.

KitKat Hazelnut: A hazelnut-flavoured filling, covered with thick, milk & dark chocolate marbled swirl.

SHOP KITKAT BLOCKS NOW