Much "bigger" sound. Probably categorized as more mainstream. Nate seemed to rebel against that idea after I/L - but I always thought his songwriting would return to that direction.
This song sounded incredible live but the production on the recorded version is disappointing. I also think the production on we are young doesn't do the song itself justice.
They are definitely going the more mainstream/singles route and I'm fucking digging it.
Edit: I want to see them plastered all over MTV and the radio. They are one of the few bands out there that really deserve it. I hope Glee covering We Are Young propells then to stardom.