We are planning our next WDW stay, which will include an AKL-Jambo studio and a CCV studio stay, reserved for "cash" through Disney directly.
The following only applies to the general public making reservations directly with Disney; I do not know the timelines involved for reserving stays any other way [such as a DVC member through Member Services].
For the last year I have been "stalking" the WDW website to get a handle on when Disney releases their DVC rooms for the general public to reserve. And I can conclusively say "it depends"

and is between 11 and about 8 to 9 months out.
For example, AKL-Jambo has availability for almost all room types (including "value" studio and 1 bedroom) for Nov 11-14, while CCV only shows studio with walk in shower available. For Nov 18-21, AKL-J shows nothing available, but CCV still has the studio with shower available. After that neither looks to have availability yet.
Sticking with a Mon-Thurs stay, to get more than walk in shower availability for CCV: 11/04/2019 - 11/07/2019 and 10/28/2019 - 10/31/2019 and 10/21/2019 - 10/24/2019 etc has both studio types; when I checked last week, you had to back into September to find more than just the studios at CCV - doesn't mean some later ones had not been released, but I never saw them. And CCV slowly loading room types instead of all at once like the other resorts do seems to be the normal pattern for what I have seen over the last year. They are slower to load any at all [one of the last resorts to load theirs in, and then when they do it will just be a studio, usually the ones with showers; then they load the other studio; then some weeks or even months later the other room types show up].
Bottom line: they will not be available until no more than 11 months out. I believe that is from the last day of your stay, but hopefully someone else can speak to that. And they may not be loaded into the system yet at 11 months out -- at least for online reservations. I haven't tried calling, so maybe the reservation centre can see them even though the website can't in that in-between zone of 11 months to whenever they show up at 8-9-10 months.
Our solution was to book hotel rooms at both AKL and WL at the 499 day mark, the earliest room only reservations can be made. Our plan is to change them to the studios once the studios are available, but if for some reason we can't get a studio, we still have a hotel room at the resorts we want to stay at for the dates we want and at a price *cough* we are willing to pay - particularly useful since fall 2019 availability is getting harder and harder to find. For our dates the hotel room at WL is actually quite a bit cheaper than the CCV studio will be.
SW