What brand new art? The map variants are basically the same as the old map with very slight variations. You spent months adding a few brushes and walls? If 10 artists aren't enough, why not pull some artist who undoubtedly do nothing out of those 2,500+ employees, or even outsource the art like you did an entire game.
If you wanted to, you'd have done it, but I guess Christmas isn't a priority for Tencent and the Chinese market.
You clearly know nothing about game development. To be honest your post is a little bit embarrassing.