Okay, here's what I've figured out. I've only checked Coronado Springs so far (and that page is now fixed on my site) but presumably this applies to all Moderates. If I find this applies to any other resort categories I'll post.
Prices within a "season" did not change. So Summer season prices are still the same, for example. What has changed is the DATES of the seasons, and those changes are substantial:
Summer season was previously 5/31 - 7/13, now 5/31 - 8/3
Value 2 season was previously 7/14 - 8/17, now 8/4 - 9/13
Value 1 season in late summer/early fall was eliminated
Regular 2 season in fall was eliminated
Fall season was previously 10/20 - 11/25, now 9/14 - 10/10, 10/14 - 11/22
Thanksgiving season was previously 11/26-11/29, now 11/23-11/29
The net result is that within the time period 7/14/13-11/23/13, many room rates went up because dates were moved into a higher-priced season. If you have a booking within that period and make changes to your reservation, the price may go up.
A few dates went down in price. 9/27-10/10 and 10/14-10/19 moved from Regular 2 season to Fall season, so the rates are slightly lower now for those dates. If you're booked within one of those time spans, it might be worthwhile to rebook your stay and get the lower rate.
Mary
MouseSavers.com