I noticed that Twitch recently added an overlay option for OBS that shows up and is for Sub Goals and Follow Goals.

What I would like to see is a Hype Train Overlay that as soon as a Hype Train activates a Train of your choosing of color and customization in the future would go across and fill and make animations encouraging people in chat to cheer. Perhaps in the Train you could see perks pop into that would show incentives for the train growing (new emotes, new badges, etc etc)