You can still get it at the parks, the way you used to.
Disney has added another option - a video chat registration that is done between 30 and 2 days before your first park visit. The person being registered for
DAS needs to be available at the time of the video chat. Someone else can answer questions for them, but they need to be available to be at least introduced and have a picture done.
This is a link to the WDW DAS changes thread which has details in the first post.
This is a link to the WDW DAS website page
With this information, I’m going to close this thread since there are multiple open threads about the video DAS registration