Classic Yoshi, Classic Mario, Classic Slime, and Classic Slenderman all in one pic.
The Legacy/Classic Update is major update coming on January 1, 2017. This update focuses on the history of the Community World.
New Statues[]
The new statues consist of older versions of statues (called Classics) being remade and new versions of old statues and reviving ones that got removed.
Classic Mario (Super Mario Bros.)
Classic Luigi (Super Mario Bros.)
Classic Waluigi (Mario Tennis)
This screenshot not only gets a good view of Classic Slime, but you can also see the old sprite of the skulls in the inventory
This screenshot from the 2013-2014 beta of the world also has the Mysterious Box.
Classic Wario (Warioware)
Classic Slime (Minecraft)
New Steve (Minecraft)
New Super Meat Boy (Super Meat Boy)
Classics Not Being Redone[]
Some classics will not be remade however. Those would be Yoshi, Mr. Game and Watch, Sonic.exe Arwing, and Slenderman.
Minigames[]
None
Trivia/Fun Fact[]
Classic Wario can be seen in this pic next to Link
This update was supposed to happen on September 11, 2015. However, it was replaced with the Empire Update.