Oh no, here we go again.
There has been speculation here before as to what the next set of HD channels we get might be (Discovery, History etc.) which was added to with the news of a potential Disney deal.
Neil had to give a conservative estimate of when more HD channels might materialise but the target launch may still be before Christmas. However, it's better to pleasantly surprise than to disappoint. Hence the apparent secrecy.
Whatever HD channels we get and whenever we get them surely isn't that important in the short term unless you're in the throws of deciding to jump ship to satellite or might buy a HD TV and sign up to the VM HD service if your favourite channel was about to become available in HD on cable.