If the Armoured Revolutions Rumours are true and we are getting a Metallic Snake and a Wooden Horse as the main two legendaries - this is my speculation on what their typing's,inspiration and theme will be.

Metallic Snake:
Typing: Steel/Poison
Inspiration: Ouroboros
Theme: Modernsation (The Metallic Snake represents the Galar region's mix of modern elements and traditional elements with the metallic snake representing modernisation.)

Wooden Horse:
Typing: Grass/Ground
Inspiration: Trojan Horse
Theme: Traditionalism (The Wooden Horse represents the Galar region's more fantasy/traditional elements)