We've been effectively trolled!
The Next Tales countdown ended...and opened another countdown.
There are now 8 days left. On that day, December 12, there will be a livestream on Nico Nico Douga at 7 pm (Japan time) to announce the 20th anniversary title.
The Tales Facebook page is doing an Advent calendar with Tales of Symphonia Chronicles screenshots. The album will be updated every day with screens from both games and be "on the subject of friendship, family, sacrifice, and Christmas of course!" I'll keep this post updated so check back every day. :3 And that's some oddly religious terminology there, but whatever. Their words, not mine.