Those pictures look really promising! We've heard from a couple forum members who were able to upgrade older Leafs to 40kWh packs themselves, so it's definitely possible. For Nissan to be quietly upgrading the packs is HUGE, but also a little strange. I mean, why wouldn't they be advertising this loudly? It almost seems like your dealer messed up the replacement and put in the larger pack by mistake.
I'm thinking this, too, since the car is reporting a SOC of 150%.