11-Months Out:
The following studios have a potential issue (to varying degrees) of being unavailable when attempt is made at 8 a.m. eastern at 11-months out:
AKV club level and value studios: most of the year problem.
BLT standard view: about half the Fall season, and occasionally the rest of the year
BLT theme park view: some minor risk in some extremely high demand times such as first week of Dec.
BWV standard view: all of the high to extremely high demand season (late Sep to marathon weekend in January; hereinafter the "Fall season") and a large potion of the the rest of the year.
BWV boardwalk view: about 40% the Fall season and only once in a great while the rest of the year.
CCV regular and "shower" studios: still developing patterns but already a problem during substantial portion of the Fall season, and many parts of the rest of the year where it is continuously getting worse.
VGF standard and lake view studios: some risk and generally limited to the extremely high demand times during the Fall season such as first two weeks of Dec, Thanskgiving time, time around NYE, and the two race weekends (Wine & Dine in Nov, and Marathon weekend in Jan).
Aulani standard studios and hotel rooms: some risk and generally limited to times in month of of June and Christmas week.
Riviera: still in its infancy in showing extent of issue but already Tower and standard studios have a significant issue during the Fall season and occasionally the rest of the year; preferred studios have also shown a once-in-a-while problem during the Fall season.
Poly, BRV, OKW, SSR, HHI, VB and VGC have not had the issue, as well as BWV pool/garden view, BLT lake view, and AKV standard and savanna view. BCV only rarely -- has popped up at times for first week of Dec and NYE time but not even that for a few years.
As to seven months out:
VGC can be a problem year round.
HHI studios are often an issue during Easter weeks and much of April, also May starting shortly before Memorial Day weekend and going to right after Labor Day weekend and then occasionally at other times in the Fall.
VB studios sometimes have the issue during summer and holiday times, but the comparable inn rooms, at least standard view, are usually open year round.
Aulani standard view studios and hotel rooms are a year round problem. All other studios have an issue during the two highest demand times of the year -- about June 6 to July 6, and a little before Christmas to Jan 3. During the rest of the year, island/garden and pool/garden have a problem about 50% of the time (and often one is open while the other is not), while Ocean View is usually open.
During the Fall season at WDW, all studios have a 7-month issue to varying degrees. The easiest to get is SSR, except it can even fill before 7-months out for race weekends, first week of December, and time around Thanksgiving and NYE. Other than SSR, OKW and AKV Kidani (savanna view more so than standard) are more available than others, but still a risk of being full during extremely high demand times (middle two weeks of Oct, race weekends, last weekend of Food & Wine, Thanksgiving time, first two weeks of Dec, Dec 23 to Jan 2).
During the rest of the year at WDW, there are two weekends when everything has a risk of being full before 7 months out: Princess half marathon weekend in Feb, and the Star Wars race weekend in April. Otherwise, OKW (except at times the near Hospitality House studios), SSR, and Kidani are usually open although Kidani standard view can have an issue at times.
BWV standard and boardwalk view, AKV club level and value, VGF standard and lake view, Riviera Tower and standard studios, and CCV both regular and shower, are usually gone, although, particularly for BWV boardwalk view and VGF, you can sometimes find multiple days and even a week open during the lowest
DVC demand times of the year: Feb 1 to the Thurs before Presidents' Day, Feb after the Princess weekend to about March 10, last week of April, and July 6 to 31.
BCV is full about 60% of the time and best chance to get one is during those lowest DVC demand times of the year. BRV and Jambo standard and savanna view (more so standard view) have an issue about 40% of the time, BLT theme park view about 30% of the time, BWV pool/garden view and BLT lake view have recently developed an issue about 10% of the time, and Riviera preferred view is starting to develop an issue, while Poly is usually open.