Doubtful. This is certainly very very low on DirecTV's priority list of potential DVR enhancements.
The good news is that you can upgrade the internal hard drive pretty easily yourself, and the architecture supports two internal drives if you want to get real big. At least this is true of the Tivo-based DVRs, like the HR10-250. Nobody has figured out how to upgrade hard drives on the new NDS-based DVRs from DirecTV, like the R15 DVR and soon-to-be-released HR20 that will replace the HR10-250 later this year.
The good news is that you can upgrade the internal hard drive pretty easily yourself, and the architecture supports two internal drives if you want to get real big. At least this is true of the Tivo-based DVRs, like the HR10-250. Nobody has figured out how to upgrade hard drives on the new NDS-based DVRs from DirecTV, like the R15 DVR and soon-to-be-released HR20 that will replace the HR10-250 later this year.