The next ticket release will be at 11:00 (GMT) on 22nd November and is for tickets covering the 13 December 2017 to 4th February 2018 (yes, over a year away!).
Tickets will be available from ATG and Nimax but only through the queuing system on the official website so don't go elsewhere ... the queu is likely to be long but it is worth hanging on as there will be a LOT of tickets (we got some in the last release!).
Good luck!