Date to be announced.
Bandai Namco has just announced that they will be holding a livestream to celebrate the Tales of Series 25th Anniversary.
The livestream will have previous producers to talk about secrets and the like regarding the development of the previous games, as well as topics that viewers would like to discuss. A questionnaire (in Japanese) is currently live which will ask you to answer about your favorite games, characters, scenes, songs and anything you might want to ask the producers and developers, etc. Important to note is that one of the questions inquires what "previous games we would like to see in modern consoles."
In addition, new information on app titles (it literally says app titles, so I'm assuming these are mainly the mobile games only) and anniversary goods. Note that they make no mention of console titles news.
The livestream will be available via YouTube and Twitter (via Periscope). The actual date of the livestream and the guests will be announced at a later date.
The Tales of Series will be celebrating its 25th Anniversary on December 15th. The date commemorates when Tales of Phantasia was first released in Japan for the Super Famicom/SNES.