About the New German tank, the Panther, there are quite a few interesting details about the Panther on the Rheinmetall website. Even a brochure.
It has an auto loader as well as many of the features that a new tank would want to have, all of the buzz words about things like being fully digitalised and able to connect to all kinds of networks and it has things like 'optimised shooter to sensor links' and the ability to command the tank from any of the four positions in the tank. Yes it still has 4 seats, one is for an optional specialist.
It's a bit lighter than a Leopard 2 at 59 tons, I found that a bit surprising, it's still a big tank and even if it has an auto loader it;s still got a big turret and it's covered in god knows what. Speaking of some of that god knows what, it has a Natter 7.62 weapons station which has all kinds of advanced targeting abilities, it's odd to have a .50 co ax but then a 7.62 RWS, though Rheinmetall do sell a .50 Natter as well so that could be used if it was wanted. It also has an inbuilt drone launcher which I suspect is a large driver behind keeping the fourth crewman.https://rheinmetall-defence.com/en/rheinmetall_defence/systems_and_products/vehicle_systems/armoured_tracked_vehicles/panther_kf51/index.php