The more I read about this 'important' announcement the more I'm thinking whats the point? Just reading through the article on the BBC web site, these I think are the main points.
(1) Unlike the dedicated set-top box the Xbox will not be able to receive or record live TV.
(2) To get the service, customers will have to first subscribe to BT broadband.
(3) Sales of BT Vision have been somewhat sluggish according to critics, with BT signing up around 100,000 subscribers since launching in November 2006
(4) People have to sign up to a 12 month broadband contract.
(5) The fact that it cannot offer the Freeview content or DVR (digital video recorder) functionality of the dedicated BT Vision set-top box - known as a V-box - may also prove a barrier.
Count me out then.
Source:
http://news.bbc.co.uk/1/hi/technology/7178661.stm