I imagine it was mainly done to stop the spread of rumours, that post's such as Marco Arment's could spark (perhaps already has?): http://www.marco.org/2012/06/

I imagine it was mainly done to stop the spread of rumours, that post's such as Marco Arment's could spark (perhaps already has?): http://www.marco.org/2012/06/11/half-assed-mac-pro http://www.marco.org/2012/06/11/half-assed-mac-pro