Yes !  HKO game client update will be the 15 of December I am so happy ! can wait to December 17  and  I readed  that there  will be new things in HKO :

New Christmas themed-maps

A brand new winter wonderland

Item Mall : you will automatically receive 300points to spend in items .

Pets can speak

 New York

Christmas quest

New Sanrio Characters

Player profile page in Sanrio Town

In-game new mail notification

All these will be in  Founders Christmas Reunion !