I've realised the black mark on the camera and images is related to scene optimiser. If its decided on the scene, it has the black mark. If it's "thinking" about it, or it hasn't identified the scene, there is no black mark. If scene optimiser is turned off, there is no black mark.
Notification panel still often doesn't expand beyond the initial "bottom" which is about enough for one notification to display without buttons, so notification panel needs to be swiped up and back down again for it to expand properly. Starting to feel like they shipped the wrong update or this one was literally just so they could get november security patch out.