Oh there are so many things lol. There's the Luigi's Mansion Beta like @Really Ilini said but also slightly creepy thumbnails I'd come across for a split second (yes that would prevent to sleep for a day). There was also the Sonic CD Majin Sonic...
My username is Cirta because it's the old name of Constantine (the city not the roman emperor, though it was named after him) which is actually where I'm from (not where I was born in but where my family originates from at least). If you didn't...
Funnily enough, the Soccer Rabbit from WL3 isn't Dunk. It's actually his brother Shoot
But now I wanna see how many brothers this guy has. Would be pretty dope if the next Wario Land game, you have to fight another brother who's gimmick was...
I like that each game gets its own villain, because it shows all the different types of people who are even worse than Wario. Though I'd be happy with cameos from former bosses if they're integrated well, and of course Syrup as a recurring...
I just realized the letter Z is kind of like the Wario to the letter S. Flipped, more jagged, comes afterward... and last. Don't tell him I said that bit!
Every Wario Land game is almost a certainty except for maybe Shake It! unless it gets remastered which I doubt.
As for WarioWare, it could be if there's a DS and Wii thing for Nintendo Classics. That being said, there's still Gold and Game and...