Wow, spoiler alert!!! Might want to edit your post and add that at the top...even if they are just rumors.
I have a strong life philosophy to never judge anything until I know for myself. So I don't feel strongly either way at this point. Having said that, it does seem unnecessary and just an attempt to appeal to a specific demographic, like elves at Helms Deep. However, as ridiculous as it was to the theme, I enjoyed seeing an elven army team up with the likes of men. After all, it is a movie. So since I spent 10 years bracing myself for something like this...it is what it is. A book to film adaptation, and films require a romantic interest.
To me she seems like nothing more than a female Legolas, so I wouldn't say she's going to be all super powered out. I was able to get over Azog being alive, so we'll see.