you are trading resolution for dynamic range.
My guess - greater than 22.1 megapixels. That gives you 3x1920 pixels across, allowing for easy bining of a 3x3 pixel block from the sensor into a single pixel of 1920x1080 video... add a few pixels to each side for video stabilization and the 24MP sensor looks very likely.
How is binning at 3x3 on a grid that repeats at 2x2 easy?
Photosensors are in a 2x2 grid, but you're not binning a quad of photosensors; just the reds together, greens together (x2), and blues together... So yes, it is easy.
In the attached image you bin the following:
And you bin down right back into a bayer pattern which you can than save as-is, or demosaic, or whatever.
That method throws away half the light collected.
The 2x2 approach bins the 2 greens, 1 red and 1 blue in the block into 1 RGB pixel. Simple and no light lost.
Rather than do the above, why not demosaic and interpolate with a simple interpolation method like bilinear? That way, you'd at least keep all the light.
Where is there light being thrown away?
A normal pixel is 1 red, 1 blue, and 2 greens divided by 2... Let's say you have an 8 bit a/d converter.... that gives you a 24 bit pixel and you have 8 stops of dynamic range..
Bin 9 pixels together... (for ease of math I will just use 8 of the 9 pixels) with an 8 bit a/d converter you get an 11 bit number, or a 33 bit pixel, or 11 stops of dynamic range.... no light is lost, it is all summed up in the final number... you are trading resolution for dynamic range.
don't understand any tech but a trade of res for dr would be the deal for many folks, I guess. anyway, I am all for high ISOs. But I can imagine, this might have its impact on high ISOs as well. Or is it like this: either better high ISOs or better DR? I don't know nothing about tech acutally, so thank you for any help.
I like every improvement on every body level as it will pay off in the next 5Ds as well