British Indie rockers Bloc Party ended their four year absence from the music scene Tuesday with the release of a new single "Octopus" and a music video for the track.  During the group's hiatus, fans and industry watchers have speculated that the band had maybe gone its separate ways, but Tuesday's release shows that is definitely not the case.  The group also announced that their fourth album, titled "Four," will hit stores on August 21st.