Are There Other Trends in Game Design?

There's a focus on how people are going to learn a game. I think about this all the time when I design now, sometimes to my detriment and sometimes for the benefit of the game. In Charterstone, there is not really much of a rule book at all. Like Fog of Love has a very neat tutorial. Root, one of the recent hot games, has a very nice tutorial in it that gets players into the game and start playing.