Wonder Woman is not gay or bisexual in the new 52. But that can be easily rectified in any of these ways.
1. Make her have sex with Aleka since Aleka is a lesbian and that would make WW a lesbian too.
2. Make her have sex with Etta Candy and thus make Etta her best friend.
3. Reveal that the reason Cheetah stopped being her best friend is because the Cheetah is straight and Wonder Woman is a lesbian and wanted to have sex with Cheetah. This caused Cheetah to become depressed and so she cut herself with a dagger and became evil and so from the trauma Wonder Woman stopped being a lesbian and turned straight.
4. Make Steve Trevor a transgendered woman and reveal that WW thought he was a woman the whole time and the only reason she loved him is because she thought he was a woman. Then after Steve really becomes a woman make him a lesbian who loves Wonder Woman.
5. Just break up Superman and Wonder Woman after they have sex for the first time because Wonder Woman says she doesn't like a man's touch.
6. Since the new 52 WW claims she loves everyone it means she loves both men and women and hence she is bisexual.
7. After meeting Batwoman Wonder Woman discovers that is is better to be gay than to be straight because straight is too mainstream
8. Just reboot the universe again and say the new Wonder Woman is a lesbian.