I just ran by the Nyko meeting rooms to find out about their Wii Remote Charging Station. That's the thing that comes with replacement rechargeable batteries and allows you to dock your remotes in a holder to charge them when not playing. Personally I find mine irreplaceable, mostly because I can never remember to buy batteries.
The thing when I demoed Wii Sport Resort I noticed that the controller was longer now and asked Nintendo if the charger would still work. Ask Nyko was their reply, so I did.
Unfortunately, it won't work, at least not while the Wii Motion Plus device is attached. The Nyko guys told me they were already looking at ways to solve the problem. They added that they believe the Wii Motion Plus attachment doesn't contain batteries, meaning it likely draws power from the Remote, which would likely reduce the battery life for the controller.
Bad news all around.