NeoGAF, via a Shonen Jump magazine scan and Namco-Bandai conference details, has details on four new Tales of... games that have been announced by Namco-Bandai.
Here are the names and the currently known details.
Tales of Destiny: Director's Cut: For the PlayStation 2, includes new difficulties, events, and etc.
Tales of Rebirth: Port of the PlayStation 2 game to the PSP.
Tales of Innocence: For the Nintendo DS, an all new title. Looks to be using an updated version of the engine used for Tales of the Tempest (the DS game that hasn't been localized for North America).
Tales of Symphonia: Knight of Ratatosk: For the Nintendo Wii, this game will take two place after the events of Tales of Symphonia for the Gamecube. The two new main characters will apparently meet the original's cast, but it is unclear whether the original cast will be able to join your party.
All of those titles are expected to be released in 2008, but Tales of Innocence may be able to hit a 2007 release date. Of course, no localization has been announced for these games.
An important detail to note is that Namco-Bandai has announced that the Nintendo DS will be the lead platform for all new Tales of... games in the future.
Be sure to check back for updates.