The latest product images reveal that the One Mix 4 will feature a digital pen, backlit keyboard with touchpad, 3x USB-C ports and a microSD reader. Apparently, there are no Thunderbolt 4 ports, and One-Netbook is dropping the SIM slot, as well.
https://www.notebookcheck.net/One-Netbook-reveals-additional-specs-and-product-images-for-the-One-Mix-4-10-1-inch-convertible.516050.0.html