Hi,
For those of you who are planning to travel in France after the train timetable change on 11 December, I just received the news that ticket sales for TGV ("Inoui") and intercity train travel between 12 Dec and 2 Jan will open on Wednesday, 6 October early morning (so probably around midnight EST on 5 October).
And Ouigo sales up to 1 July 2022 will open on the same date.
As a reminder, the earlier you book, the better the fares - and trains around Christmas do get fully booked.