Now that Day 3 of Comic Con is through, we now have new info on what to expect from these two. I wasn't able to see any of the actual events since Marvel didn't live stream theirs and I didn't pay initial attention to DC's. I did manage to see the Justice League trailer on IMDb, and so far it seems like they're actually shaping up and lightening the tone. Flash reminded me of Tom Holland's Spiderman a little and Aquaman actually looks awesome. I'll have to see if this will end up good, since I was divided on Dawn of Justice.
I mainly wanted to see the new footage of Guardians of the Galaxy Vol. 2, but Disney isn't releasing it online right now, so I'm still left in the dark. I did look on the Wikipedia page to see the new characters introduced, and it seems like Blockbuster Buster will be disappointed that Adam Warlock and Quasar aren't in there. I'm especially disappointed that Warlock isn't included considering the subtle clue that was in the first movie.