"Blackout" drop out a "Circus" single..

Yep its official bonus track & "Blackout" track "Radar" is being released as the fourth single from "Circus". This has been confirmed by Britney Spears on her official website & Twitter page. To me it's a disapointment due to "Radar" being released a year ago as a promo single for "Blackout" which will highly serve as low sales for this single to peak. Not sure on when the video will debut but hopefully the video is good enough for this single to go far & become a hit.