Justice League issue two establishes that Steve Trevor was tricked into finding Themyscira by a government official who knew about the hidden Amazons when no one else did. This will no doubt play a role in a future Wonder Woman or Justice League storyline. The big question is: Who is pulling the strings?
The same issue also establishes that Wonder Woman can't return home for some reason. It could be a magic thing. Or she could have been banished. This seems like it should be pretty important, but Brian Azzarello has already ignored it. (Find out why here).
Are there any other loose threads you can find?