I have a feeling its going to be a character. Its about time.
I don't see why people complain about music... music is a huge part of the game, and it an update you can listen to over and over... I would prefer a character or a level, but the music is great for the most part and I love hearing the new tracks.
EDIT: off topic- I made a 'dawn patrol' sig. I'm not sure if theres one sig maker, as they seem to all be in the same style, but I had a whack at in anyway. I didn't have any brushes or fonts other than the default so go easy on me, I know its not the greatest piece ever =P because it looks like all the DP sigs match, I tried to make it look similar to the rest (no boarder, a stock on one side, a name and 'dawn patrol' on the other, a color theme, a single character stock, an abstract background, etc....)