Reply I got from Directv:
Thanks for asking about MPEG-4-capable equipment. A replacement offer is not available today because we have not yet started to convert any of our MPEG-2 programming to the new MPEG-4 transmission standard. As we get closer to converting channels, we will notify customers who may lose DIRECTV HD programming to contact us to schedule an upgrade. We hope to begin converting some channels this summer, but do not yet have a definite timeline. Until then, your current DIRECTV HD equipment will continue to deliver the great DIRECTV HD programming you receive today.
In the meantime, we are offering the MPEG-4-capable equipment at a substantially reduced price for current DIRECTV HD customers in select markets who want to add the new local HD programming. Visit our web site at DIRECTV.com/Local to see if HD locals are available in your area.
The current price to replace your primary HD receiver and dish is $99, then $99 for each additional HD receiver replacement. If you live in an area where we have launched local channels in HD and would like to replace your equipment now, you can order now by calling 1-800-DIRECTV.