While their Android SDKs for A10/A20 and A13 are now updated to 4.2.2 Allwinner didn’t made new SDK for A10S since February stopping at Android 4.0.4 and Linux Kernel 3.0.8
Also the price of A10S now is risen above the price of their A10 (which have much more hardware features like SATA etc.).
This seems a good sign that Allwinner do not want to put more efforts on further Android development for A10S and want to move the customers to use A13/A10/A20 in their new designs.
They didn’t gave us any notice that they will stop A10S production, so A10S will be available for purchase, but they just do not release newer Android versions and Linux Kernels for this SoC, and with the price rise they will move all new project in the right for them direction.