It will be important for her to show a more mature image this time. She's 27, she can't keep releasing stuff for teenagers
I hope we get to see a My Happy Ending type of single, midtempo, meaningful and catchy; but not so "depressing". She should release something fresh, something she hasn't released before, but at the same time something that shows what she is. Obviously, no more Girlfriend or WTH, those songs make her look desperate and stupid (no offense).
If things are done properly, I can see: Top-10 1st single, top-20 2nd, and top-50 3rd. +3 million album sold with ease. If she's able to "recover" the US and UK market, the rest of the world will eat her up again like her first 3 albums.