Originally Posted by eleveneleven
Well it's going to move while in your pocket, but I can see light detection working for that. Thanks for the insight!
If you want a better idea of how it'll work, watch this review from pocketnow (for the S4 S View Cover):
Galaxy S 4: Samsung S View Cover Review - YouTube
Starting at the 1:47 mark, you'll see him mention that "in theory" this should help with power consumption and you'll also see him follow that up with taking the phone on and off standby.
The more I watch that, the more I'm actually considering one of these, but I'll likely wait for one with wireless charging integrated.