NPCs now have indicators to yell you if you're able to speak to them. This is more or less apart of a step I want to do, which is provide more non-verbal player feedback on interaction (Verbal feedback on anything easy to understand, such as the game pausing and telling you "Walk up to an NPC, and press the action button to speak to them" is just going to get on the player's nerves), so it's easier to understand what does what.
For non speaking NPC's that have interaction such as signs, the sign will appear on the player's head with a question mark instead of "..."