Soz about complicating things, It appears to a joint effort and the reason some of these threads go on and on and on and on..............
The HD channels do appear on the Programme Guides and you can call them to screen ie, Sky One HD Ch 197, Sky Movies 9 & 10 HD Ch 311 & 312 etc, etc. (if your digi box has received the update, which it may not have done yet)
There is nothing being transmitted that is viewable by "US" at the moment.
Don't worry, you're not missing out on anything, other than a blue screen and an info banner.