They may not use the same reservation process this year. They have not released any info yet on how/if this will happen. The last one required people to get into a queue, like the tickets. to reserve a certain number of panels, signings, and other events. Originally, they said that if you didn't get a reservation, then you wouldn't be allowed into that panel and that there wouldn't be any lining up for spots. Well, many people didn't get many panels or signings reserved. I think I only got 1 of the big panels,
Disney+, and 1 medium panel, Haunted Mansion. The first people into the "random" queue were basically allowed to get so many reservations that there was not much left for others. In fact, some of the people at the end of the queue didn't get anything; there was absolutely nothing available. They theoretically got onto their computer at the same time as everyone else. The organizers eventually said people could line up but would not be guaranteed a spot. We have no idea what they will be doing this year, so I wouldn't get my heart set on anything that has happened in the past. Hopefully, this year will be more equitable. I would, however, read past trip reports to get an idea of what could happen to be prepared. The panels will probably be organized about the same way/have the same presentations, especially the big ones in Hall
D23, so reading about those to see what interests you would be good. Good luck!