Huh, I wasn't aware this was coming to the switch
By the way, has anyone seen this supposed leak? Not sure if real or not
While I like a few of those ideas (e.g., NLG making a Luigi's Mansion sequel based on Super Mario Land would be cool—perhaps he'd be cleaning out Daisy's castle?), I don't think a single one of these "leaks" like this has ever been real. It's way too easy for a random person to make one, and I don't know if we've ever been given proof that any company actually has documents like this.
As for what's on the list itself, I can't imagine Nintendo subtitling a Metroid Prime game "Scars." I also don't see how it'd even be possible for Playtonic games to already be working on a DKC game when they're still working on the Switch version of Yooka-Laylee and patching up the other versions while also being a tiny developer. I'm sure they're planning their next game right now, but a DKC game by them would have to be ridiculously early in development and probably a 2019 game at the earliest. I can't see current Nintendo showing anything like that off until 6-12 months before launch. Other issues I have with it are that I don't think Capcom would call MH XX "Generations 2" in the US since it's an expanded version (I'd guess they'd just call it "Generations Ultimate"), and NMH3 (if it even ends up being that) should be waaaay too early in development to show up at the showcase. Additionally, too many of these games would have to be 2018. Lastly, there's no way all of these games could be shown in a video that's 30-minutes long, since a number of them would need proper introductions.