Right off the bat it appears that user account info lives outside the custom styling of each subreddit, this is a good thing and creates consistency for access to my stuff.
Secondly it looks like each subreddit gets to decide which view works best for the content of that subreddit. /r/askscience will benefit from a compact view, while /r/pics would benefit from a card view. As long as I'm able to change the default and have it stick next time i access that subreddit, I'm all for this.