No spoilers besides who the main character is for each part (didn't get to JoJolion because they ran out of time) and a few things that made the episode 'bizarre'. Without context, it doesn't really spoil it for me. The only thing that sort of gotten spoiled was the final episode for Kill la Kill which they showed in the previous panel before it!
The JoJo panel was awesome because they had a portion where people posed as the characters in the anime/manga and I was able to find a lot of people who enjoy the fandom. It made up for me being unable to find any merchandise in the vendor halls though. It was all Attack on Titan, Hetalia, Fairy Tail, One Piece, Naruto and others that are still popular! Either I'll have to go to a convention dedicated to anime OR hopefully it picks up enough steam that people will be selling things for next year!