After something similar less then a month ago – with the mystery title being a new Digimon game, Namco Bandai has released another teaser website for an unnamed game which can be seen at the following link HERE or viewed above. Overall, going with what they provided: the design and the text which reads “I, who began to run, still wasn’t aware.” (Credits to Siliconera for the Translation) – it is very hard to tell what this could be.
Originally I was thinking that it was possibly a new Tales of… game considering this would be the art style I would have expected for another game in the series, however they already have one of those on the table so unless it is a PSP game or something along those lines, I wouldn’t give my guess much weight. Other suggestions from myself are a second game in the Fragile Dreams series or even a second game in the Eternal Sonata series (Althrough how many other artists they could find to replace Chopin’s role is debatable).
Anyway, I look forward to seeing what this turns out to be.