We might also see an announcement for the PowerShot SX70 IS. It’ll come with a crazy zoom lens whenever it does arrive. 24-2000 f/3.7-8.0
f/8? Hang on a second, let me do some math.
Let's guess that it has the 16MP 1/2.3" sensor. That sensor has 1.33 micron pixels.
The spacial cutoff for f/8 for green light is 1/( 0.00055 * 8 ) = 227lp/mm. Assuming we need 3 pixels per line pair, that turns into 1.47 microns per pixel. So, this thing at f/8 would have an MTF of zero at the pixel level at the long end of the lens.
That's actually a good thing - it has enough focal length that the sensor isn't undersampling the optics. Of course, it also means you're getting everything out of the optics that can be extracted, and that's assuming the optics have no aberrations. If they do, you don't need this much focal length (or this many pixels) to get all the resolving power available.