This datamine was shared with the folks at LetsPlayVideoGames.com, although they note that the data was actually posted on Reddit about a month ago but there wasn’t much response about it. According to LPVG, what makes the datamine seem somewhat credible is the fact that games such as Mario Tennis Aces and Mark of the Ninja: Remastered were part of it, both of which have since been officially confirmed by Nintendo themselves.
Also based on the datamine, it appears that there could be several Pokemon remasters headed onto the Switch, such as Pokemon Chemical and Nuclear. Given that the Switch is expected to get its own Pokemon RPG in the near future, we wouldn’t be surprised if Nintendo were to bring older Pokemon games onto the Switch as well.
The datamine also hints at Zelda remasters, like Spirit Tracks HD as well as a new title called “A Link Across Islands” which seems to be in a similar vein to other titles like “A Link To The Past” and “A Link Between Worlds”. There also seems to be mention of Overwatch and Fortnite Battle Royale, but since all of this isn’t official information, it should best be taken with a grain of salt for now.