I am not sure if this has been covered before. I have just phoned WDW and have booked a meal at the crystal palace for 28th september you can now book 180 days in advance instead of 60 days.
Yes, this new ADR booking period came into force late last year. You can book upto 180 days in advance.
Also if you are staying onsite you can call 180 days before your arrival date and then book 10 days worth of ADRs in one go