It seems that every recent iOS update turns Bluetooth back on if you had previously disabled it. Why would Apple do this? Kashmir Hill of Forbes proposes that the answer has something to do with iBeacons. follow link
Avoid Simple Typos
If, like me, you find yourself typing 2911 in place of 2011 entirely too often, you can have Mac OS X (either Lion or Snow Leopard) fix such typos for you automatically. Just open the Language & Text pane of System Preferences, click the Text button at the top, and then add a text substitution by clicking the + button underneath the list. It won't work everywhere (for that you'll want a utility like Smile's TextExpander), but it should work in applications like Pages and TextEdit, and in Save dialog boxes.
Why Apple Keeps Turning on Your Bluetooth
I have spoken with a developer who could not comment but would say that "we were doing what the design specs called for."
For whatever reason, Bluetooth is being enabled after each IOS upgrade I concluded that it was/is a conscious decision by Apple. To what end I do not know. Are there any other preferences or hidden features they are enabling that we are not aware?