It used to be you didn't get anything until about a month out from arrival date when you'd get a booklet summarizing your reservation, activities on site, luggage tags, DME info, PhotoPass card, and any perks that may be included in your reservation.
Then that evolved to getting a letter a few months in advance to psych you up.
Then now, for our upcoming trip, I'd booked about 10 months in advance and about a month after booking, I got the psych you up. Another month after that, I got a box in the mail with a booklet summarizing my reservation, magnet that told me when I can book FP+, and a USB drive of a vid pumping up
MDE. Basically, marketing materials for not a whole lot of use.
As for what comes next,