The upcoming movie promises a lot of potential and hopefully it delivers. I am most excited for the appearance of Wonder Woman here.
I am going to predict here that Wonder Woman and the Amazonians she is a part of are actually descendants of the crew of that crashed Kryptonian scout ship from Man of Steel.
This helps to explain her abilities and of course her compatibility with Superman as well.
I also expect that Aquaman’s involvement is linked to the world machine’s ocean devastation from the first movie as well (you know the big ass space tripod that was pounding away at the south Indian Ocean).