Back? Crazy, huh? Who is she? Well, there are several theories out there, so let's run them down...
The new Spectre - The physical embodiment of God's vengeance on Earth? I can see fans being upset if this was the case, however I feel that this is not. Once again, she is observing, not getting involved... yet.
The new Phantom Stranger - The Entity who has served as a spiritual guide for several members of the DC universe. The mystery woman has a quality similar to Stranger. It's a possibility.
Someone else - Other theories include: The Monitor or his assistant Harbinger, Kismet, a female version of Pariah (the scientist in the original Crisis), Raven, even Barry Allen's mom! Do you have any theories yet? If so, please share. I'm interested in hearing them.