Just a thought, maybe the rMBP is experiencing long delivery times due to the impending release of ML. If you think about it, apple is probably producing two different retail versions of the rMBP at this moment in time one with Lion installed and the other with Mountain Lion ready for the release of ML. Therefore this in theory could affect the amount of rMBP being produced for sale today. I know they offer a free upgrade to ML once released but surely there must be some kind of overlap? we might see shipping times slashed when ML is released.