Snipped from the DSTV forums:
Unless there is a really big train smash about to happen, HD will be with us within the next few weeks.
That means the launch of the HD PVR (costing about the same as the current PVR) as well as at least one full-time HDTV channel.
An option to keep your existing PVR and add an HD PVR to it will be made available at negligible cost.
A stand-alone HD PVR will have the same monthly cost as the current PVR.
Any installation with one-only wire will not be able to use the HD PVR.
The HD PVR requires 4 feeds originating from at least 2 independant LNB feeds.
(I.e. a quad LNB or a twin running through a multiswitch)
A SATCR (single cable LNB solution) might also be available at launch - but that requires all decoders connected to it to be SATCR capable - and currently only the HD PVR will be SATCR capable. (I.e. it is not a solution for a block of flats, etc.)