Smartthings never did manufacture its own devices: it contracted with third parties.
They recently decided to get out of the business of support and sales of home automation hardware, and have chosen new partners to take that over.
Aeotec is the partner for Europe and North America. They are a well established manufacturer of zwave devices, but the smartthings branded devices always used a different protocol, Zigbee. So it looks like initially all of the “New” aeotec devices for The smartthings platform will be identical to the previous smartthings devices, just with a different logo but made by the same third-party manufacturers. I expect that will change eventually.
Here is the Official partnership announcement: