A new 'Password Settings' section has been discovered in the Settings app of the current iOS 8.3 beta which will permit users to set up their iPhone, iPod touch or iPad so that downloading free iTunes apps and iTunes media won't require an Apple ID password.
The new option is only exposed to users when Touch ID is disabled, reports 9to5Mac. With Touch ID enabled, the new option is unavailable.
This is understandable to an extent, because approving purchases — free or paid — with the tap of a fingerprint is a frictionless experience.