Super Smash Bros. for Nintendo 3DS and Wii U

Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for Wii U (colloquially named Super Smash Bros. 4 and abbreviated as SSB4) are the upcoming fourth installments of the Super Smash Bros. series being developed for the Nintendo 3DS and Wii U. It is a sequel to Super Smash Bros. Brawl, in which Sonic made his debut in the series. Like previous games in the series, they are being developed by Sora Ltd. along with Namco Bandai, and directed by Sora Ltd. founder Masahiro Sakurai. On June 2012, it was announced that Sora Ltd. is working alongside Namco Bandai Games in developing the games.

Development
Prior to the official announcement and trailers in 2013, Super Smash Bros. 4 was announced in the E3 during 2011, however, the title name was not known and no information regarding to the game was announced, as Masahiro Sakurai was still developing Kid Icarus: Uprising. Sakurai also commented that a Capcom character may be in the game as well. He also stated that an 3DS version of SSB4 will be released as well, have more changes in SSB4, and also have dual support for the 3DS and the Wii U. Sakuria also wanted to make the gameplay experience more better than its predeccesors. And after months of development, it was comfired by Nintendo that the first screenshots and a trailer of SSB4 will be show during a 2013 E3 edition of Nintendo Direct.

In the Nintendo Direct of E3 2013, Mega Man from the Mega Man series by Capcom was announced as the guest character of the series (and the third 3rd-Party Character, after Sonic and Solid Snake, to be in a Super Smash Bros. game). They also announced newer characters such as the Villager from the Animal Crossing series and the Wii Fit Trainer from Wii Fit. During a Q&A with Masahiro Sakurai, during the 2013 E3, it was revealed that both games may not come out at the same time. It was also revealed previous characters may not make it due to the Nintendo 3DS's space limitations.

On 1 October 2013, during the Nintendo Direct, Sonic the Hedgehog has been confirmed to be another playable character, making this his second appearance in the series since Super Smash Bros. Brawl. Windy Hill from Sonic Lost World is also recognized to be playable as his home stage in the Wii U version, however, there is no announcement if that level will be on the 3DS version.

Trivia

 * Super Smash Bros. 4 will be the first Super Smash Bros. game to be released on a handeld system under the name Super Smash Bros. for Nintendo 3DS, as well as the first Super Smash Bros. game to be released on two systems.
 * Although it could be a coincidence, both Sonic and Mega Man appear in Super Smash Bros. for 3DS and Wii U, when Archie Comics had recently made a crossover between the two comic franchises, known as Sonic & Mega Man: Worlds Collide.
 * Sonic was revealed on October 2013, the same month that he was confirmed to be in Super Smash Bros. Brawl in 2007.