All the confusion about BT Vision 2 having HD tuners seems to come from masona2's posted article. However, I think that's just another journalist spouting opinion or gossip as fact to try and get a scoop. As the article states:
"The new box for BT Vision 2 is expected to upgrade the tuners to Freeview HD, although BT has not released further details on the hard disc capacity or other features."
This Which? review of BT Vision 2 states that it doesn't have Freeview HD.