Sony has filed recently for certification two new Playstation 3 sku’s in South Korea. These new models are CECH-4205B and CECH-4205C.

Apparently these models could only be a minor update upon the current model (CECH-4000), the called “Super Slim” with a smaller manufacture process, less power consumption, etc.

Besides, earlier this month another sku’s appeared in the Japan’s Minister of Internal Affairs and Communications webpage for the CECH-4200 model in its 3 versions (A, B, C) and the development model DECH-4200JA.

20130613 01 Rumor: New Playstation 3 models incoming? | VGLeaks 2.0

We can assume that the main difference between both models is the region.

Thanks to Kotaku.