Have you heard! There will be Tales of Symhponia 2 (Knights of Ratatosk) playable on the Nintendo Wii.
You play with new characters, but the game takes place two years after the events of the first, in the newly formed world of (nameless?). You do get to meet the original characters, but I suppose they are all celebrities now and you'd have to make an appointment

The player also has the ability to tame monsters as pets (to use in battle), and though world map strolling is eliminated (there is a new point, click, and warp system) there are a lot more things to discover and a bunch of mini quests to complete. I hope they release more information soon ^_^.