We have trialed pre-orders before and despite regular updates and PRE-ORDER all over the product page people were still asking why their order had not been shipped, so we chose not to use pre-orders.
If the product is out of stock we include an email form on the product information page, where you can enter your email address and be notified as soon as the product is available again. Once the emails have been sent your email will be unsubscribed and deleted from the specific list.
Ongoing updates will be available on social media. Once we have a rough ETA a date will be posted, prior to that a lot of the logistics and supply chain are out of our control so we cannot accurately determine a time frame.