I'm not sure what the point would be.

An 1070 has 1920 cores so 2048 cores is not much of an upgrade. The 1080/1080Ti has 2560/3584 cores for comparison.

The only point I can see is if its built with 14nm technology like the 1030/1050/1050Ti while the rest of the 1000-series cards are based on 16nm fabrication. I'm not sure that slight efficiency upgrade would worth it to push a new card but who knows.