This will likely have little effect on the numbers we see (and publish) because almost all of them are national ratings numbers, but I know that local broadcasters/advertisers have been clamoring for some DVR viewing measurement of local shows. Although, I thought that they were asking for the same C+3 commercial ratings measurement that's done on a national basis. I'm sure there are some commenters who may know more about this.
Nielsen will unveil its Live + Same Day ratings in January in an effort to best represent viewing in the age of the DVR. The ratings giant solicited client feedback in September, and has planned the new ratings as a response to its customers' concerns about measuring viewership in the DVR era. Research showed that a large chunk of DVR playback occurred within an hour of the live airing.
via Broadcasting & Cable.