Famitsu has a nice little info dump this week on Tales of Xillia 2. Gaius and Muse are returning from the first game, but there are also some fresh faces.
Ridou is a doctor of Clanspia Company. Chronos is the third spirit following Origin and Maxwell. The Arosal Orb is replacing the Lillial from the first game and theere's a new side quest called Cat Dispatch.