Neither amenities nor housing is new - amenities is the same happiness system as Civ V, only the penalty for settling new cities and adverse empire-wide effects from overall unhappiness are gone (though it's shown at a local level, in essence happiness is still global - luxuries offset happiness 'points' until they're used up, rather than being restricted to a particular city). Housing is a straight import of the Civ IV health system. Right now my experience is that the game looks deep at a superficial level because it has a lot of options and there's something to do management-wise in most turns. But nearing the end of my first full playthrough I can't escape the feeling that you can more or less random-walk your way through and only settle on a strategy fairly late and still be successful at least up to Emperor. There's potential for depth here, but you can't really call the game deep if there are many options but you can win without a particular game plan. The game still gives a very solid framework to build on.