Portal Stories: Mel is currently being worked on by Prism Studios and is due out in Q1 of 2015.
Here is a trailer for the mod Thanks to Destructoid for the heads up.
[youtube]https://www.youtube.com/watch?v=jwPkPCvy-GA[/youtube]
On the mod's steam profile, they give the lowdown on the story and what to expect from the game.
It tells an entirely new story[...]
