Meh. This is like retconning out Supergirl when they did Crisis. It worked for the moment, but it went against something very much at the heart of the character's history. I like the Perez Etta as a template, but Diana needs a grounded friend, and Julia, Vanessa, and those people didn't fit with the DMA background. It's a deliberate evolution of the character, but I think it's extrapolated quite fairly from the material we have, and Rucka and I have a great little story showing what hasn't yet been shown that made her a bit more fearsome and less timid.
As for Giganta, hmm. I'm following what's been put in front of me on this one, and she's been spoken of as if they'd been enemies for some time in her previous appearances. However, I have never seen an adequate reason for WHY she hates Wonder Woman the way she does.
So here we have an interesting character with no real motivation, which means their conflicts are usually going to be a bit of a thin gruel. So we are exploring that...it's just beginning, really.