Nintendo to retire Wii network services in Japan, including the Weather Channel
An End of Life notice to Japanese customers reveals that a total of six channels will be put out to pasture, including News and Weather, as will the the ability for Wii Friends to exchange data over Wii Connect24. It's not clear whether these terminations will apply globally, and in any case Nintendo explicitly says that other key services will continue for the time being, such as the Wii Shop Channel.
Will they extend it global eventually?
I would expect them to eventually. And I would expect that Wii Shop to continue since it is part of the Wii U (in vWii Mode)