From the EU portal:
Leaves have fallen. Winter is coming. The trees are getting ready for a cold winter. But come spring next year, the trees will be back again in all their glory and stronger than ever! The same goes for our Top of the Tree special, which currently hosts the Polish heavy tank branch leading up to the 60TP Lewandowskiego.
Every month, you have the chance to vote for your favourite Tier X vehicle and its line to be discounted in World of Tanks. Because of the impending activities throughout December and January and the madness that comes with them, this special will take a long and well-deserved holiday break, meaning in short that there won’t be a Top of the Tree special in December and January 2019.
Next January, we will give you an update on the Top of the Tree special, so stay tuned!