I was able to log in to the elite website today, took many tries though (did not pay for the extra elite stuff).
It was neat, not all the features of the website were working, but it shows your career stats for every option of the game (i.e. gun type, accessory, perks, maps, etc...). It also has map overviews and shows the map spawn points for different game types. You can also change your classes online and then push those changes to the game for the next time you log on to multiplayer.
I had heard they'll have a feature called Heat Maps, which show your KDR overlayed on the physical location of the map, but that service wasn't working.
Elite is a neat service, but albeit pointless in the grand scheme of things.