[*]Hornet's height and speed define substantially the game's world size, complexity and intelligence of enemies. Hollow Knight could take having a simple, Goomba-style enemy, even if at the beginning; Silksong goes a step beyond that.
[*]You spend more time either at full health or almost dead, and the gameplay is kind of snapping between those two states. Healing in battle becomes more like a "beat in the dance", letting players to take the decision instead of having the enemies doubling over for an obvious chance in healing.
[*]The journey doesn't end at the Citadel; comparing Silksong's pacing to Castlevania: Lords of Shadow, the developers note that there will be a variety of other lands to go.
[*]There's a variety of quest types: a 'Hunter' quest will have you go and fight someone; a 'Wayfarer' quest implies a secret location somewhere that waits to be found.
[*]Hornet's Tools, analogous to the Knight's Charms, are Hornet's version of various useful stuff seen around the world.
[*]Silksong will match Hollow Knight's difficulty, but it's aiming to be accessible to newcomers as well.
[*]The fact that Hornet is a talking character alters the way the story and her intentions are exposed. "The player will really quickly [...] get a basic idea of who Hornet is, her attitude and her starting goals".
[*]'Fleas' are what 'Grubs' were in the first game; with the difference that 'Fleas' have more variety in the kind of trouble they get into.
[*]The game's cartographer, 'Shakra', will leave behind trails of golden rings, like Cornifer and his trail of papers.
[*]Hornet spending time in that cage at the beginning makes her lose her traditional powers, having to restore them through the course of the game.
[*]Team Cherry's next game after Silksong will be unrelated to Hollow Knight. It looks like they are already working on it on an initial stage.