I think you should stop waiting becasue the developers aren't working on it anymore :(
They made an offical post at their website.

sorry, but I don't have the premission to post any links. :(

The Walking Dead: season 1-2

Half-Life 1-2

Halo 1

Gta San Andreas

I just want to say that Madness Project nexus 2 is on Kickstarter!

If you liked the previous game, then you should definetly check out their site, and support them.