Super Smash Bros. Ultimate will give us amiibo for characters that weren't previously in Smash 4 -- so yes, we are getting a Solid Snake toy at some point. The thing is not all of them have been dated or revealed yet (like Snake), so I figured I'd clear up some of the confusion.
Okay so here's the scoop. Ridley, Inkling, and Wolf will launch in December 2018. Following that King K. Rool, Piranha Plant, Ice Climbers, Daisy, Pichu, Simon Belmont, Richter Belmont, Chrom, Dark Samus, Young Link, Isabelle, and Ken will drop in 2019.
King K. Rool, Piranha Plant, and Ice Climbers are all available for pre-order now worldwide (in the US you can find them at Best Buy) for a February 2019 launch: the rest are in limbo but have designs that you can check out below.
If you want a full picture of the amiibo landscape right now, feel free to check out our always-updated comprehensive figure guide.