The Etta Candy epilogue hints that things might not be over for the crew of mercenaries and that they might play a direct role in the future of the DCEU.
Wonder Woman is clearly reshaping the DCEU into something incredible, and having Etta play a part is a smart move.
The epilogue adds a lot to the DCEU, drawing the story threads closer together and making it more connected.
Whatever it is Etta has tasked these mercenaries with carrying they may just find themselves carrying the future of the DCEU.