According to recently rumors on CR, the upcoming Canon EOS G1 X Mark III will be announced in Mid October, 2017. G1 X Mark III will likely be a fixed lens Canon EOS M5 mirrorless camera. This means G1 X Mark III will also have an APS-C image sensor.
See previous rumored specs of G1 X Mark III:
- 24mp APS-C Sensor (The PowerShot G1 X Mark II was 1.5″ sensor)
- Dual Pixel AF
- DIGIC 7
- 24-120mm lens (35mm equivalent)