Putting the Beats products under Schiller might only be temporary. It could be like a quarantine period where Apple decides if they can be integrated into Apple's existing design organization, or need to be kept separate permanently, or sold off. Integrating acquisitions can be disruptive and I think Apple's approach with Beats seeks to minimize the disruption to current development work.
If there really is a deal in the works, I hope the delay is for renegotiating the price due to the music moguls running off at the mouth. A couple hundred million should be about right for violating non-disclosure agreements. If they are going to work at Apple, they have to be less about grabbing the spotlight and more about advancing the team.