Hello, Pam Skorupski.
Welcome to Microsoft Community!
I can see that you really love the Microsoft Surface Ergonomic Keyboard, which is indeed currently discontinued in the Microsoft Store.
Perhaps you could also try searching sites like Amazon or Best Buy to see if any authorized resellers are still able to offer the device.
At this time Microsoft has no solid release plans for new products for the ergonomic keyboard. Community Support did not find a related product preview in the information available for viewing.
The option to connect to multiple devices that you mentioned is indeed a worthwhile feature to adopt, and the community will be logging user requests and providing feedback to Microsoft as allowed.
We can still expect Microsoft to release more useful peripherals in the future. If you're interested in other features and updates to Surface products, keep an eye out for upcoming Microsoft Build or Ignite events, where Microsoft may announce more information about new products and features.
These are some of the thoughts and real information I can share with you at this time.
Thank you for your understanding and interest in the Microsoft community.
Best Regards.
Leo.L - Microsoft Community Support Specialist