Nintendo just announced that Wii Sports Club will be released on Novemeber 7th. It features 5 HD remade original Wii Sports minigames with online 'club based' functionality. The game will feature a competitve league of sorts, allowing you to compete with different regional or state clubs around the world.
Upon it's release, only Tennis and bowling will be available, but they do plan to add more soon. You can download the game 'hub' for free, but each sport must be bought individually for $8.99 each, or you can buy a 1 day pass for $1.99.
I think the online league idea is brilliant. It makes it a lot more competitive.
I really hope Nintendo integrates this league idea into other games. Imagine a Smash Bros. or Mario Kart regional league. :D