From Canon JP (translated):
Apology and guidance regarding product supply status
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.
On a related note, the Canon RF 100mm F2.8 L Macro IS USM Lens is now shpping in the USA (officially, July 8th).