The game has been described as a "commemorative title" for the 20th Anniversary of the Tales Franchise which would be 2015. It's also the first time a Tales title has been announced for both JP and NA at the same time according to all the postings I've found so far. I can't seem to find any notes on when Vesperia was announced for NA but that game came out in the same month for both the JP and NA versions.
If they didn't have any intentions of releasing both versions close to each other I don't think they would have announced both versions at the same time. They seem to be making more efforts towards placating over-seas fans so I'm hoping the release ends ups pretty close.
They're releasing way too much information for it not to be released this year in Japan. I'm guessing a late 2014 release in Japan.