I too ordered with the Dutch Reseller iCentre yesterday. Shipment should be received on the 4th of May in their warehouse, looks to be on track but it wouldn't be the first time it get's changed at the last moment. They expect to start to be able shipping/selling the things at the 6th (5th is a national holiday here).
If they can sell me one I'll just cancel my Apple order. We'll see.
At which iCentre you made your reservation for the MacBook? I reserved one for 6 May at iCentre Emmen.