I just wanted to add ... my 5s had worst battery life than my old 4, basically lasting around 16 hrs of regular use (vs basically 24 hrs on my 4)... after I disabled "Background App Refresh", and turned motion off after 7.0.3 my phone has gone almost 2 days without a charge
I thought I'd share this...
and by the way (like others have mentioned) while I liked the Parallax effect, I definitely like the new fade-out more as everything seems faster, so I'm keeping motion disabled