I saw comments about people asking why there are no resort discounts for Marathon Weekend - they rarely release discounts this early anymore. If they do release any I wouldn't expect them until late October or November.
I agree that Disney never releases the discounts until a few months in advance (to get a feel of how popular those times will be, to determine how much to discount), but you can always make a reservation whenever and have them apply the discount at a later date. Though from what I recall last year, the discount didn't start until after Marathon Weekend was over, so there may not be one this year either
That said, I've booked through a race-affiliated travel agent (GetTravel) for several years now, since they have some great discounts on hotels and park tickets. Beginning with the 2014 races, Disney changed the booking rules so you must now get your race registration through the travel agent to get the special hotel pricing, but the cost of a 5K registration (even at the semi-inflated price) is more than offset by the savings over 5 nights. Even more so when you book multiple rooms!
Was Goofy at 85% before? I forget...sort of stopped paying attention.
It was somewhere in the 80's. I assume that the jump to 90% was to reflect that a certain number of the Goofy spaces were removed, meaning that a higher percentage of the remaining total registrations have already been sold
I don't think that 90% is completely accurate for any of the races. Assuming they use numbers similar to last year, there will be about 15,000 half-only and full-only spaces, and 5,000 Goofy-only spaces. Assuming they added another 10% to the half and full-only groups, that's 1,500 additional registrations; 1,500 registrations is 30% of Goofy's total, so something doesn't quite add up. At this point, I think it's more of a representation of "Yes, we still have some registration spaces available, but they're limited to act quickly!" than a hard percentage