Since the reveal of the next PS3 Tales game, we haven't heard much about the title, save the occasional concept artwork that's leaked over the last few months. Namco Bandai, however, has just filed more trademarks, which might let us gleam the possible title for the currently unnamed entry in the series.
The game will utilize the contrast between light and shadow, which will lead to the game having a different art style direction than Vesperia's anime-style graphics or Graces's watercolor-style graphics (it could be more of a hand-painted or oil painting-like feel if the concept artwork is any indication). Baba stated that when he saw some of the concept artwork images running on actual hardware he was very impressed.
2010-065775 テイルズオブエクシリア
2010-065776 テイルズオブイクシリア
2010-065777 Tales of Xillia
2010-065778 Tales of Faithus
2010-065779 Tales of Zestia
The first two trademarks are essentially alternate pronunciations of the third trademark, Xillia. While it's not clear if the game will pick from these trademarks, the previous batch of trademarks were filed back before Graces's release, which could mean those were meant as alternate trademarks for that game.
Whatever the case, we'll have to wait until this December to find out, which is when the official website for the game will be properly unveiled.
http://www.talesunion.com/news/Tales-of-Xillia.html
* I know this is old news. Just saying where I based it from