I haven't been this excited for an album in a LONG time. I've been a Green Day fan since I was about 12, and love all their old stuff. However, American Idiot came out when I was 16 and it changed my life. I still consider it a absolutely flawless album. So granted, I don't think the new record will be able to claim that. I'm still stoked though, and I'm loving what I've seen so far, from the format to the artwork.
http://www.greenday.com/splash/splash.php
http://en.wikipedia.org/wiki/21st_Century_Breakdown