The main source of power for these creatures is an incredibly long lifespan. Hutts live over 1000 years and are considered children up to the age of 130 years.(Speaking of children, all Hutts could have babies as they had both male and female organs.) Hutts live on the philosophy that states that if something is out there to have, might as well belong to you. Because of this there are few morals within society and planets under their control are often filled with criminals, as well as their bounty hunter predators.
There is a very good chance you will run into these bloated slugs. We will walk on their home planet, enter their palaces, and screenshots have been made showing these guys. They will likely be quest givers as they are not very mobile making it difficult to imagine fighting them.
The only problem I have with these guys in the game (very minor) is the eye size. Unlike what everyone else seems to complain about (big hands, big lightsabers) this Hutt has tiny eyes. When you look at Jabba his eyes are huge. Of course this guy could have normal eyes and just a big mouth, adding to the list of over-sized things in the game.
Lets hope we will see more of our slug overlords soon.