It seems that the pre-orders for the Canon RF 14-35mm f/4L IS USM Lens is higher than Canon can fulfill.
From Canon Japan:
We have received more orders than expected for each of the following products, and it will take some time before delivery.
We thank you for your many orders and apologize for any inconvenience caused to our customers. Thank you kindly look forward for your understanding.
・ Ring type tripod mount E (B)