Though I am not sure how I feel about the "Quattro" layout of the blue pixels vs the green and red sub-layers. Typical Bayer arrays rely on the green channel for luminance while this Foveon Quattro will rely on a blue channel.
That does seem strange, but it helps to note that the Foveon style sensor does not really detect separate blue, green and red signals. It is a more complicated mix than that; something like:
top) lots of blue, some green, a little red
middle) lots of green; some blue and red
bottom) lots of red, some green a little blue
This has always made for greater demands on processing to reconstruct primary color signals.
So it will be interesting to see how well that "blue with some green and a little red" can be used as a proxy for luminance.