Let me guess: Four filters, right?
That was genius, mcfly. You implied the CCD was divided into bands by color filters, but didn't mention how many there are.
But we know the sensor is overall 1600x1200, which is a 4:3 aspect ratio.
short side in degrees = 18.3 * 3 / 4 = 13.75
short_side / 4 = 13.75 / 4 = 3.43125
And the raw images in each band will be 1600x300.
So therefore and I rest my case.
So the images will in fact be Cinemascope® shape. The question for me is still whether they'll do macro-level wizarding to compile those funny-shaped mediocre-def images into something beautiful we'll all gasp over.
Trust the boffins.