While we may not exactly when Sonic Mania comes to the Nintendo Switch, going by a video shown as part of Sonic Mania’s Steam listing, we do know it will release on the 15th of August, 2017.
There is a chance it could also release on the same day for Switch, but plenty of games that have come to Nintendo platforms have often come either to Steam first and then to a Nintendo platform second or vice versa. However since SEGA has yet to weigh in just yet, in terms of the Switch release of Sonic Manic, nothing is set in stone just yet releases, but as soon as a date does finally emerge, we will not hesitate to share it!
Although don’t be surprised if the video is suddenly pulled. Leaks like this are often pulled almost immediately.