4) Is auto update enable immediately after installation?
Pretty sure I had to go into settings and then enable the app updates. Could be wrong though. In either case, it didn't automatically start updating the apps the moment iOS 7 was installed so you'll have more than enough time to turn it off if you wish.
1) Did they remove the feature to double tap home to control music? That was so useful.
2) Are we still limited to 8 tabs in Safari?
3) Anyone else having trouble opening the Control Center? Could be because I have a Casemate, but I swipe from the bottom and it takes many times before I get the menu to open
In reference to #3 it is probably your case. I have same problem with my griffon survivor. You have to start ALL THE WAY at the bottom of the screen with your finger moving and the it comes up almost instantly. Pointed out to me by a helpful tech at an apple store who sniffed "that is one reason why we recommend not using cases, we like you to have direct contact with our devices". I am sure they also like you replacing them everytime you damage them too!