From Zendesk:

Why are sales starting for everyone before all pre-orders have been delivered?

Shipments to EU and FIN pre-order customers are well underway and continue as quickly as possible. DNA Kauppa will also start selling a limited number of phones to Finland based customers this week.

After we scheduled the sales start with DNA we encountered some unexpected technical problems in the shipping process for pre-order customers. In good faith with DNA, we postponed the DNA sales start to try to recover from the situation.

This delay was not enough to compensate for the technical issues. In our estimation it did not make sense for anyone to prolong the delay any further.

Unfortunately one consequence is that a small amount of devices will be available thru DNA shops in Finland before all mail deliveries reach every pre-order customer

If you have completed your purchase by the 2nd of December you will get your Jolla in December. We are unable to provide you with exact delivery times. We’re doing our best to serve the pre-order customers as quickly as possible. Due to the aforementioned technical problems in the shipping process a small portion of pre-orders will be delayed. You will receive a notification with more details when your device has been shipped.

We sincerely apologize for any delays and thank you for your patience.

How are you dealing with shipping the pre-orders?

Shipment are being handled as follows:

Finnish pre-orders from first campaign in May.
Remaining EU pre-orders and second-wave pre-orders.

If you have completed your purchase by the 2nd of December you will get your Jolla in December. We’re doing our best to serve the pre-order customers as quickly as possible. Due to technical problems in the shipping process a small portion of pre-orders may be delayed. Therefore we are not able to provide you with an exact delivery date at the moment. You will receive a notification with more details when your device has been shipped.

We sincerely apologize for any delays and thank you for your patience. We are very grateful to all our pre-order customers who have supported us from the start. Jolla could not have made it so far without you, it's a joint adventure - bear with us!