Namco Bandai recently trademarked a large number of Tales-related names in Japan. Among them, Tales of Zestoria, Tales of Zestiria, Tales of Zestias, and the recently announced Tales of Link. But only one of these trademarks was filed in Europe: Tales of Zestiria.
Namco Bandai filed for the name on August 30, according to the European trademark database. Considering it’s the only Tales name they filed for, it’s likely Zestiria is the name of the next big Tales game. It’s also possible we’ll see it outside Japan, as well.