Get your torch relay ready, Nintendo has announced (via their Facebook page) that Mario & Sonic at the Rio 2016 Olympic Games will be released for the 3DS on March 18. The sports-themed minigame collection will also be released for the Wii U later this year.
The 2016 Summer Olympics will kick off on August 5, so we can probably expect to see the Wii U version of Mario & Sonic at the Rio 2016 Olympic Games sometime this Summer.