In the latest free update for the comedy dating sim Monster Prom, the "Startkicker Update", developer Beautiful Glitch has given it a new ending. See Also: Some previous thoughts on Monster Prom, it's actually really funny.
This new ending is secret though and they're not wanting to spoil it but they did mention the "joys of entrepreneurship alongside Spooky High’s more money-savvy students" which might give you a clue. There's also a bunch of summer outfits included to match the season.
As for the modding tool, it's being released in waves with the people who backed the Kickstarter for the sequel getting it first, after that for DLC owners and then everyone else 6-8 months later. You can see the trailer for the new tool below:
Mod tools are awesome, they really help extend the life of a game way past what the developer is often able to with time and budget constraints, so seeing more games allow players to be creative is great.