"Turn Up The Radio" with an appropriately summery video appearing around May is really the only viable single choice at this stage. Give it as much of a push as they're capable of, and see what happens. If it flops, then just chuck anything out there. If they can't get that to smash, then nothing else on the album will (Well, maybe "I'm Addicted", but still). "Gang Bang", while amazing, should get a video at most. At this point, Madonna's singles need to be self-starters (She certainly isn't going to help them out.) if they're going to be remotely successful. As a brooding, bonkers album track it works just fine, but it would just be a nightmare of a single. Radio wouldn't touch even before they edited out the last two minutes.