Happy to hear you are enjoying the game.
With the body sizes, I will pretend it's the first option you said when in fact it is the second.
On the topic of the lore being expanded. Things have been written quite in depth and there are still some parts to be revealed. Although since Sammy is not the hero of this story, a lot of that stuff will be revealed in how it impacts the life of your average person. There will be a story happening in the background that will change daily life for everyone.