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Not sure about the camera but if a fingerprint sensor will function under a screen then why not an ambient light sensor!
Because the fingerprint reader is supposed to use ultrasound so can sense through a thin solid object. An ambient light sensor needs to see the outside world so can't be behind something that isn't transparent. It could potentially be on the side I guess
Same deal with front facing camera - don't see any alternative for that
Speaker you could possibly have in the top edge which would still be close to your ear, or vibrate the screen near the top (Sony's new OLED TV does this).
Proximity sensor maybe could be under the screen
I imagine they'll continue to work on embedding or moving front facing sensors to reduce that top lip, but they have to start somewhere