I sure as hell am. I recently played the first game and it's just awesome in every way. I can't wait to see what gets done with the multiple characters aspect and what they do with the story.
What do you want to see? I personally would like to see masks make a return... The way they're doing it in this game I think is having each character have a set of abilities and weapons... Not sure if masks will still be a thing or not. Also, since there are multiple characters, how about some co op? That'd be awesome.
Also, level editor? Hell fucking yes. Who else can't wait for Hotline Miami 2?