Apple Macbook lineups to get update before holiday

People familiar with the matter say development of Core 2 Duo versions of all three models -- the 13-inch MacBook, 15-inch MacBook Pro and 17-inch MacBook Pro -- are now complete and all that's left is for Apple marketing to pull the trigger.

But those same people indicate that precise launch dates for the respective models remain fluid and Apple customers should expect the updates to arrive anytime between now and the time Thanksgiving rolls around in late November.

Similarly, it's unclear whether Apple will launch the new consumer MacBooks and professional MacBook Pro models simultaneously, or if it will space the releases to assure it maintains enough of Intel Corp.'s Core 2 Duo processors to properly facilitate each launch..