Google has updated the cover image size on Google Plus in what is a good move i think, an advance on the previous layout for sure.
The aspect is still 16:9 but the size is smaller, info now appears overlaid on the left with main cover photo on the right see below;
Recommended size is; 1081 x 608 but the max size of 2120 x 1192 still applies.
See mine here; Carl G+
