Some alleged leaks aren't worth writing about or giving any attention to, but there's something very peculiar about these supposed Super Smash Bros. screenshots – showcasing the game running on what is presumably Nintendo Switch hardware – that makes them worth noting. Posted by an anonymous 4Chan user, the images showcase previously 3DS-only modes that never made it into the Wii U version, but they've been visually upgraded to more closely resemble the aforementioned Wii U iteration.
All in, there are four images showcasing a handful of different aspects of the reported port: the 3DS version's Smash Run mode; the Paper Mario stage from the 3DS installment; and a "Break the Targets!" mode. It's important to note that there is little to no evidence supporting these being legitimate, but Super Smash Bros. fans can take them as rather well done fan pieces based on the premise of a Smash Switch port.
Curious fans can check out the rumored screenshots below.
Traditionally, leaks like this wouldn't be worth noting. With that said, 4Chan previously played host to the original Super Smash Bros. for Nintendo 3DS leaks that ousted the final roster prior to its official unveiling. That past example and the quality of the screenshots themselves are why this information seemed worth drawing attention to.
With that said, several rumored and very legitimate leaks have arrived in the past (i.e. the rumored inclusion of Rayman in Super Smash Bros.) that turned out to be pranks. It's important that gamers realize that they are far from legitimate at this point in time, despite how badly some fans are hoping they may be real.
With Nintendo's E3 2017 presentation coming up, and a rumored port of Super Smash Bros. for 3DS/Wii U said to be in the cards for Switch, it's possible that fans will know whether or not these are the real McCoy sooner rather than later.