Shonen Jump has a teaser for Tales fans. The magazine says the Next Tales of title will be announced during Tales of Festival 2012, which will be held in the Yokohama Arena on June 2 and 3rd.
It sounds like this Tales title won’t be a remake or "re-imagining" since the Next Tales of game takes place in a new world. Namco Bandai is saving all of the key details like the platform(s?), release window, and story info for Tales of Festival 2012.
If you’re in Japan, check out the official Tales of Festival 2012 site for information on how to attend.