I heard it was a 29MP sensor, but actually used resolution may be lower, so maybe 26mp? Well, considering rumors, speed performance will make one care less about such small matters.
A new Sony A9 III rumour suggests that the upcoming full-frame camera will debut a new sensor with global shutter when it launches. Global shutter would completely eliminate rolling shutter, but may come at the expense of burst speeds or video frame rates. The Sony A9 III is expected to launch on November 7 at a special event Sony has planned in Japan.