firstly escuse me for my bad english , i'm studiying it and i'm sure that it will be soon (I hope eheh) better.
I'm an italian guy interested in monkey island since i was child. And i'm here to say to you that talltale is not the only company interested in a sequel of EOMI. I'm sure that you certainly didn't hear about "The darkness of Monkey island", due to the fact that it is an italian project started 3 years ago when talltale was sleeping , and because it is made by fan. Don't worry around the fact that it is made by fans because it is made as a grapic adventure is. So it is a professional project made by fans.
Everything you want to know about that you will find at http://www.voodoofgisland.altervista.org/encreafangame.html
Eventually if you can understand something of italian should you go at
IM HERE TO SUPPLY THE TELLTALE TO CREATE A TOTALLY ITALIAN VERSION OF TALES OF MONKEY ISLAND AND TO ADVERTISE YOU ABOUT THE PRESENCE OF THE REAL MONKEY ISLAND 5.