Exactly, there seems to be a trend towards larger sensors in video/digital cinema:
… Panavision unveiled a prototype for a digital camera that will have a sensor equivalent to 70mm…
http://nofilmschool.com/2013/01/red-epic-dragon-arri-alexa-sony-f55-f65-panavision-70mm-camera/
The diagonal of ‘regular’ 65 mm (52.5 x 23 mm) film stock is 56,8 mm
The diagonal of the 45 x 30 S sensor is 54,1 mm