I've been to JL today at Cribbs Causeway (Bristol) and been told they haven't had any iBooks (although they had both the 12" and 14" on display) in stock for customers for severtal weeks, the list of waiting orders is up to about 30, and they have no date for restocking.
Then I went to PC World, also at Cribbs Causeway, was told they had sold their last one this morning, and that they were waiting for Apple to confirm the delivery date of the next batch. The shop guy also let slip that they had taken the Mac Mini off the floor 'because Apple were pulling the G4'. Read into that, what you will.
😕