Pre-orders for a Kingdom Hearts Kingdom Key silicone ice tray are currently open. It will cost 2,200 yen or approximately $20 and is immediately available for pre-order. It will release on December 25, 2021 in Japan and July 2022 for other regions. The Kingdom Hearts Kingdom Key ice tray is available to pre-order through the North American and Japanese Square Enix online store. [Thanks, Famitsu!]
The silicone ice tray comes in two parts. This allows for water to freeze into a perfect shape resembling the Kingdom Key. You can take a look at the ice tray below:
Square Enix released Kingdom Hearts ice trays in the past. This included molds of popular iconography from the series like the Heartless and King Micky emblems. However, more recently Square Enix has released other Kingdom Hearts merchandise, like a Heartless pillow.
There are also plans to release more Kingdom Hearts related merchandise in celebration of the 20th anniversary of the series. This includes a Kingdom Hearts chess set and luggage. More information will be revealed at a later date.
Additionally, Kingdom Hearts 1.5 + 2.5 ReMix, Kingdom Hearts HD 2.8 Final Chapter Prologue, and Kingdom Hearts 3 are scheduled to release for the Nintendo Switch. However, these titles will be available strictly through a cloud based service.