The Super Smash Bros 4 Pic of the Day features a robot enemy from Sonic the Hedgehog, Dr. Eggman's Eggrobo machine.

"Pic of the day. Here's Dr. Eggman's machine, Eggrobo. It'll appear as a guest character in Smash Run and attack you with laser beams," wrote game director Masahiro Sakurai in the Nintendo Miiverse.

The 3DS screenshot shows Eggrobo on a stand as an Assist Trophy. See the picture here.

Yesterday the Mii Fighters were showcased in action in a Wii U screenshot.

"Pic of the day. Here are some weapons the Mii Swordfighter can use: Shurikens of Light, Chakrams, and Gale Strikes. You can control the direction the Chakram is thrown, or even make it stall in midair. The Chakram is also the only one of these tied to the side special move, so you can use one of the other items consecutively with this one," wrote Sakurai in the Miiverse.

In the picture there are three Mii's, they all appear to be dressed as the pirate type version. They are all throwing a unique weapon which is explained in the caption. See the image here

The full character list for the game so far is: Mario, Luigi, Link, Samus, Kirby, Fox, Pikachu, Bowser, Donkey Kong, Pit, Olimar, Toon Link, Princess Peach, Sonic the Hedgehog, MegaMan, Wii Fit Trainer, Rosalina, Zelda, the Villager, King Dedede, Lucario, Little Mac, Diddy Kong, Zero Suit Samus, Greninja, Charizard, Shiek, Yoshi, Ike, Pac-Man, Mii Fighters, and Lady Palutena.

The game's release date for the 3DS was revealed as October 3, which was a push back from its original July launch. The Wii U version is still unconfirmed, but it is anticipated for the holiday season.