Have you enabled the Hyper-V role or loaded Visual Studio? If yes, to either (VS adds the Hyper-V role by default) then Connected Standby is disabled as well as Sleep, your only choice is Hibernate or remove the Hyper-V role.
Personally I'm going to use my Azure MSDN benefit and build my VMs there...
Jeff, do all VS's enable Hyper-vs or just 13? It causes my wifi to fail on restarts! I have to turn wifi off and back on each time!
If that's the case, i'll probably return my pro 3!