The updates are coming from the studios....not cyberlink. The HD DVD updates are available via the internet...these updates are not downloadable via the cyberlink player as it causes the system to crash in most cases.
I don't see stand alone players doing the same thing otherwise you would buy them?
Bluray's even worse as none of the manufacturers even have a stand alone player that will update via the internet other than the PS3.
It may have been discussed in previous threads but I'm not convinced it's not the cyberlink software based on the history I've had with getting HD DVD to work this past year.