Camera Roll has been renamed to "Recently Added'. The rest of the albums are still there for me.
If you're viewing it year by year, does it mean you're choosing the photo icon at the bottom of the screen? The one which has "Photos", "Shared" and "Albums"?

I think not much changed with Photos. One feature that's good is that now the time and date of when a photo is captured is shown above the picture. Also cool is the category for "favourites" and "recently deleted".