Expreview.com (machine-translated from Chinese) believes that NVIDIA will launch the GeForce GT 1030 to compete in the low-end. It’s difficult to tell how confident they are about this next part, due to the translation, but they believe that it will be based on a new Pascal design, GP108, rather than a further-disabled GP107 (as seen in the GTX 1050 and GTX 1050 Ti). Those parts have 640 and 768 CUDA cores, respectively, which might be where their estimate of 512 CUDA cores for GP108 comes from.
As for the merits as a product, it seems a little odd to me. There is some room for it in terms of performance, sliding between the GTX 1050 and integrated graphics with a GTX 750-class part, just with higher clocks and/or lower power due to the Pascal architecture. It does seem risky, though, considering the GTX 1050 already occupies the $110 USD price point.
The post also suggests that the cards will have 1 GB and 2 GB variants.