Gladius 2 is in development at LucasArts, or at least, it was at some point. Eurogamer is reporting that concept artist James Zhang, had entered both Gladius and "Gladius 2" on his "client list" of past and present projects, and uploaded some artwork to his website.
There were also some excellent character and spaceship sketches for Knights of the Old Republic 3, which have since been removed. You can probably find them archived elsewhere though.
Source: Eurogamer