For those of you that dont know what a Nexu is, it is the cat thing from the Geonosis Arena in Episode II. The Nexu is a predator from the planet Cholganna that would hunt all sorts of arboreal critters. This creature is a very fierce predator and is a popular target for big game hunters. There is also a large bounty on live captures as they are popular for gladiatorial combat. One danger of these creatures is they would be released into the wild by collectors that could not care for them, and they would breed to provide a danger for all people on a planet. There were even packs of these creatures on Coruscant by 130 ABY.

As you can see in some of the gameplay videos, these creatures seem to be your run of the mill wild animals that need to die. How much of a challenge they will be has yet to be seen, but if they live up to their reputation they should be well above average, even for the heroes we are made out to be. How widespread these creatures are is still yet to be determined for Star Wars: The Old Republic. For now it looks like Tython has an infestation and Jedi trainees are left to clean up the mess.