I don't think nested ships are coming soon. I think there would have to be a fundamental shift in how the game works under the hood to allow for it, in regards to being able to switch ships outside of a docking area, having multiple ships outside of the docking area, the persistence/tracking of leaving a ship on a planet, or some random place in space, dealing with the rebuy calculation if you get blown up in a Panther with another ship in its hangar.
Destructible faction fleet carriers are supposed to be arriving though in PP 2.0 - these will be present in stronghold systems.
I could be docked in one aligned with the Power I have allegiance to while it's being attacked by a hostile power. What I'm not sure of is if FD will allow it to be totally destroyed while I'm docked or if it will just be driven off (though heavily damaged). Guess we'll find out near the end of the month .
I guess what I'm saying is the Panther could be implemented as a mini-carrier - with persistence but destructible. It's a possible design option