It was only earlier this year that Ys VIII: Lacrimosa of Dana made its way to Nintendo Switch, and already Nihon Falcom are gearing up for the next title in the series. French outlet ActuGaming recently interviewed Nihon Falcom President Toshihiro Kondo, and alongside a variety of other questions about the company's history and games, they closed off their interview with a question directed at any potential readers might be able to look forward to. Kondo then confirmed, per a google translate posted by Twitter user @AboveUp, that "Regarding the Ys series, we are working on a new game. It will not be a remake but a brand new title. It will be about Adol and it will be right after the events of Ys VIII. I hope you will look forward to it."
This piece of information comes as a bit of a surprise, considering many longtime fans of the series almost expected an Ys V remake to come following Ys VIII. No further information about the title - including release window, platforms, or otherwise - was detailed, though considering Ys VIII was originally revealed during TGS 2014, we might be able to expect further information about the title during this year's show.
We'll be sure to update you with new information about the title when it arrives, hopefully within the near future. Once again, thanks to @AboveUp on Twitter as well as ActuGaming for the news!