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If this sensor is about 20mm wide and a 3:2 ratio, the lens would be about a 40mm equivalent lens, which would make sense, since it looks similar in proportion to the m4/3 20mm pancake. If this sensor is actually Canon's 1.6x crop sensor, then Sony should take notice of this lens design, because the Zeiss 24 is huge in comparison, despite being a little faster.
Remember we don't know how the lens performs or what the register of the camera is. Canon could have gone with a much longer register (as Samsung did) to make compact lens design easier, or included compensating microlenses on the sensor or accepted the quality tradeoffs that Sony did with the similar-sized 16/2.8. And the Zeiss 24 is unusual in that it is extremely telecentric, which is why it is so large and also one reason why it performs so well on the NEX-7.
Frankly I suspect the large size of the Zeiss 24 is in part a reaction to the response the 16/2.8 got, the originally shown prototypes were much smaller and it grew to the current size late in the game. The 16 gets widely panned for its poor edge performance, ignoring the simple fact that it is in fact a very good performer across most of the frame and that for the cost, it's an excellent performer. Even the Sigma 19/2.8, which is widely considered a remarkable performer, is only a little better at the edges than the Sony 16, and the Sigma is both larger and less wide, making the design simpler to execute.