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2021 will have the final 2 expansions. On the left side of Galar is an island and the Expansion pass will be called the island of heart. This will be about 2 things. Capturing a new pokemon but catch the male and female forms. These will be the only pokemon you can use on the island till you complete the main task. You will have to beat the mini gym and all challengers on the island. Once this happens, you go to the temple of soul where the 2 pokemon merge and evolves into 1 pokemon. This pokemon turns out to be the islands legendary.
Expansion pass 4 is called the royal path. This is a new part of Northern Galar. The metro tube will allow you to get here. This is where the royal family of Galar lives. A new evil team is there planning on taking the royal's pokemon. You chase them around, beat them, get into some other tasks too. At the end you get the face the royal gym. The princess is the leader who you will battle against. By winning the battle and gaining a badge called the royal badge. By having this badge, this allows you into new areas of Main galar such as Galar mine no.1 you can get to a new entrance to go to the underground section plus you can go to the factory on the way to Glar mine no.1 etc.
Both expansions will have loads of dens for max raids, new pokemon, new forms etc. Expansion 4 will feel more like base game while expansion pass 3 will feel like the wild are and 1 and 2.
Isle of armour. 9 new pokemon including the legendries. 10 new Galarian forms. Apart from the 5 we know, Alakazam will be a physic and fighting type. This will be Mustards main pokemon which can also Gigantamax in the tower of fists. Pineco line will become grass. Glameow line will be ground type.
Leon shows up twice in the isle of Armour. One to check your progress with Mustard where he mentions Mustard was his mentor. The next time you see leon, he will be the penultimate challenger in the tower of fists.