The Nintendo Switch is the 2-in-1 portable home console that was released on March 3, 2017, in the United States. While it was only launched with one major title, 'The Legend of Zelda Breath of the Wild' easily fulfilled the expectations of buyers. It wasn't until late October 2017 that Super Mario Odyssey came out, finishing off Nintendo's great launch of the Nintendo Switch and securing a spot alongside Breath of the Wild in many 'Best Games of 2017' lists (Gamesradar, Forbes, Time, etc.).
Nintendo recently announced that the Switch had, as of Dec. 31, 2017, already surpassed the Wii U in sales by 1.3 million units. The Wii U was considered a "commercial failure" in the US, selling only 13.56 million units worldwide during its lifetime (2012-2017). The switch has sold 14.86 million units since last March, though neither of these consoles makes a dent in the wildly popular Wii console, which sold 101.63 million units in its lifetime (2006-2013).
I personally do not find the success the Switch has shown very surprising. My Wii U only gets used for one reason: 'Super Smash Bros' for Wii U, or Sm4sh as it is popularly called. My friends and I have put so many days of playtime into Sm4sh since its release that we never really thought of how horrible the release and longevity of the console had been in the States. Naturally, since the competitive Smash scene has been growing and the recent discovery that the Gamecube adapter for the Wii U does work on the new console, people look to the Switch to lend its power to bring Smash to a new level; or perhaps a familiar one.
Nintendo has an unspoken (or in some cases, denied) vendetta against competitive Melee. Yet fans have made it a meme that Nintendo should release 'Melee HD,' or a remastered Melee of sorts. I find this incredibly hard to believe. Nintendo (or more specifically Sakurai, the creator of Smash Bros) doesn't like the faults in the game that competitive players have utilized and begun to love, like wavedashing or desyncing. The new Smash games have been made to curb these options.
The most likely option is that Nintendo will release Sm4sh like they did with Mario Kart 8 or Pokken Tournament - a port of the original with all the DLC included in the base game; perhaps a couple new characters.
No matter what happens, Nintendo has confirmed there are plans to release a major Pokemon game on the Switch sometime this year. Having played and loved Breath of the Wild and Mario Odyssey, that's enough for me to look forward to.