Please say someone read my massive over-simplification of DC continuity in the other thread, please...
As to this redesign, I'm unsure. I liked her redesign in Arkham Asylum and this seems mostly like more of the same. But on the other hand this is like going a little too far with more of the same.
The top needs to be at least a tank top, and not open at the front, the shorts need to be trousers not shorts, and when will people realise that Harley's hair is blonde? She wears a hat and mask, she does not dye her hair.
But otherwise, apart from minor quibbles I'm pretty okay with this as redesign.