On the Ridley talk, I'm just going to base this solely on them taking the time to have Shulk's reveal include the Masked Mechon coming up on him at the end. While the viewer doesn't specifically see him, anyone who played Xenoblade should recognize the voice. So, I'm inclined to think one of the modes, perhaps All Star, will have the characters encountering various bosses from each game as they go, which should naturally include an encounter with Ridley since there's not much else iconic to pull from the Metroid universe other than Kraid and Mother Brain.
So, something fun to consider might be just who all would show up via a game and their character representation.
Mario/Luigi/Peach/Bowser : Koopa Kids, Big Boo, ??? (Possibly something from SMRPG)
Link/Zelda/Shiek/Gannon : Darknut, one-eye spider boss, Gannon's wizard form from LttP, ???
Sonic : Robotnik, Mecha Sonic, Knuckles, ???
Mega Man : Some Wily machination, Proto Man, Cyclops, ???
Samus/ZSS : Ridley, Kraid, Mother Brain, a Metroid (possibly one that evolves drawing from II), ???
Icarus/Palutena : Eggplant Wizard, ???
Donkey/Diddy Kong : ??? (Never really followed this franchise)
Little Mac : King Hippo, ??? (lolTyson)
Kirby/Dedede/Metaknight : ???
Marth/Ike/Robin : ???
Pokeymanz : Team Rocket and Meowth
Shulk : Masked Mechon, Egil, Telethia, Zanza
...and more I'm forgetting or really couldn't think of, anyway. Like the Miis and Trainer. Still, could be a pretty beefy marathon mode if that's the intent.
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