DirecTV is in control of all features and bug fixes on the DirecTiVo's. My understanding is that DirecTV has to pay TiVo for any development. Since DirecTV doesn't want to be paying an outside company for PVR software. They are claiming that it isn't anything they know about and will slowly be pushing everyone to the DirecTV PVR.

IMHO
The funny thing about this is that with all the Patents TiVo/ReplayTV has I'm sure the DirecTV PVR will end up costing them more then if they didn't change the original contract with TiVo.