I probably have watched the trailer too much, but I realised that there various callbacks to important lines in the first movie in it.
We open with Diana's line to Barbara: "My life... hasn't been what you probably think it has. We all have our struggles." Here I'm reminded of what Sameer said to Diana in Veld about everyone fighting their own battles.
Then of course we have the verbatim return of Steve's line about saving today and the world, but later on when he say "you know what you need to do" it reminded me of his and Charlie's exchange by the end of the 2017 movie: "Oh my god, what are we gonna do?"; "but we can stop that plane".
Then we had Diana's line "Nothing good is born from lies, and greatness is not what you think", which reminded me of Hippolyta's "fighting does not make you a hero".