According to several sources the equivalent of the GTX 950 and GTX 960 (we don't know the names yet but let's call them GTX 1050 and 1060 for now) would be released later in the year, an Autumn release meaning the Christmas season.
The chip empowering the product will be a 16nm fabbed Pascal under the logical code-name GP106. The GP106 is used for price competitive and sensitive products that hit a good price/perf ratio.
If we chart things up (and the chart below ids very speculative) we see the following. BTW the GP104-400 for the Ti might very well become a GP100 based SKU, which would make more sense
NVIDIA GeForce | Possible name |
Pascal | Fab | Board | Date | |
GTX Titan X | >> | TBD | GP 100 | 16nm | Reference -> AIB | TBD |
GTX 980Ti | >> | GTX 1080 Ti | GP 104-400 | 16nm | Reference -> AIB | June/July |
GTX 980 | >> | GTX 1080 | GP 104-200 | 16nm | Reference -> AIB | June |
GTX 970 | >> | GTX 1070 | GP 104-150 | 16nm | AIB design | June |
GTX 960 | >> | GTX 1060 | GP 106 | 16nm | AIB design | October |
GTX 950 | >> | GTX 1050 | GP 106 | 16nm | AIB design | October |
So from the looks of it this summer will be all about the successors to the Geforce GTX 970, GTX 980 and GTX 980 Ti.
Nvidia will release mainstream GP106 GPUs later this year