When a feature is present differently than in the previous version, it doesn't mean it's missing. You should check all the active elements in the top right corner for the supposedly missing functionality and see whether it's actually missing. Notably the user menu in the very corner may have taken over some of the elements.
You'd better get used to Gnome folks changing stuff all the time for better or worse, or move away to some other option. I don't think they will change themselves ;).
NetworkManager (feel free to add back the tag if you were indeed interested in that) is a system daemon. How it is presented in Gnome 3 is another thing. You should also distinguish Gnome Shell's NetworkManager applet (called network-indicator and Gnome Control Center networking module that is usually launched from the applet.
You can always run
gnome-control-center separately or you can run the original
nm-connection-editor tool if in doubt. When some option disappeared for you, it may have various reasons, for example Bluez 5 integration in NetworkManager is far from finished but AFAIK Blues 5 is actively promoted by Gnome 3.8 developers.