When you push a pig in a minecart and saddle it, you can ride the pig and use WASD to move it around.
/summon minecraft:minecart ~ ~ ~ {Passengers:[{id:"pig",Saddle:1b}]}
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Confirmed. The pig and minecart seem to face in random directions, but all the movement is based on where the player is looking. Also the controls are reversed (e.g. W moves you backwards).
EDIT: It also seems to gain momentum whilst off tracks. If you ride it around on the ground for a bit, then go back onto some rails, you start travelling forward at more or less full speed.
Controls being reversed is being tracked at MC-51632.
Can confirm in 21w03a. You can use this following command to make this issue much easier to reproduce:
/summon minecraft:minecart ~ ~ ~ {Passengers:[{id:"pig",Saddle:1b}]}
I can confirm