Some quick thoughts...
There is definitely a villian they haven't announced yet. There has to be some type of powerful common denominator that will unite them for the "greater good" and make the realize they need a Justice League.
So Bruce Wayne is beefing with Superman, meanwhile... Clark Kent wants to take down Batman. Cool.
Wonder Woman seems as if she will have a separate mission in this film, that will over-arch into uniting the two. She seems as if she's aware of them (and Aquaman) already and is on some spy/"uniting the 7" shyt.
Aqua Man as a kid? At 2:25? Im sure thats a tie in scene. But where the hell does Jason Mamoa fit into this?
Lex Luthor looks trash, Lex Luthor sounds trash, terrible casting. Clearly was Bryan Cranston's role.
Superman is still entirely too Dark to me, and he plays Clark Kent and Superman exactly the same. Nothing goofy, or off putting about him to throw you off the scent of him being Superman.
Affleck looks cool as Batman. But he looks very stressed as Bruce Wayne tho, and I always thought of Bruce Wayne as relaxed and "Playboyish"... nikka look on the verge of hanging himself in Wayne Manor.
Looks like it will be around the same level as "Man Of Steel". I think it will be 45 minutes too long. Reminds me of Watchmen, obviously because of Snyders involvement. But just in the fact thats its trying to nail the genre so hard, it may be overdone.
Looking forward to it tho.