I read that the TV adapter was intended only for a certain Japanese network, and Nintendo had no intention of selling it in the USA. I've seen the web browser in action, and while neat, it's pretty under-featured, and it's really only good for checking simpler web pages for news or email. It does let you save web pages for later, though, so you don't have to be in a wi-fi hot spot all the time to use it.
Neat stuff, but the praticality is shakey for both.