Correct me if I'm wrong, but didn't Apple get a bulk shipment of processors from Intel a few years ago before they were released and available to any other manufacturer? With all of the hiccups that Intel has had, it is probable that they want to make Apple happy and will be releasing chips to them before they are available for anyone else.
In years past Apple has done early/mid and late year MBP releases, it was atypical, although it has happened once or twice, for them to release an early and mid-year MBP with no late year release. I, like a lot of others here, am anxiously waiting Apple's new release, however we will have to continue waiting.