IGN confirms the fulton recovery system is back (of course it is, the goat, lol), we'll be able to knock on surfaces again, to distract guards.
The fulton is apparently much more functional this time, meaning we can take everything from vehicles to livestock back to Mother Base.
We will also be able to get a chopper back to the fully customisable mother base at any time, and it will be explorable! Characters like Ocelot will be hanging around there too.